I. Appenzeller: Protostars, Mitt. Astr. Gesellschaft 31, 39 (1971)
I. Appenzeller: Observed properties of the interstellar magnetic field, Memorie della Societa Astronomica Italiana 45 N. 1/2, 61 (1974)
I. Appenzeller: Investigating star formation with the Space Telescope, in: Proc. ESA-ESO Conference on Astronomical Uses of the Space Telescope, D. Machetto, F. Pacini, and M. Tarenghi eds., ESA 1979, p. 47 (1979)
I. Appenzeller: Star formation, in: "Star Formation" (10th Saas Fee Advanced Course), I. Appenzeller, J. Lequeux, J. Silk, eds. A. Maeder and L. Martinet, Swiss Soc. of Astron. and Astrophys. Geneve (1980)
I. Appenzeller: Star formation and pre-main-sequence stellar evolution, Fundamentals of Cosmic Physics 7, 313 (1982)
I. Appenzeller and B. Wolf: New observational results on S Dor variables, in: Proc. ESO Workshop "The Most Massive Stars", eds. S. D'Odorico, D. Baade, K. Kjaer, p. 131, (1982)
I. Appenzeller: Recent advances in the theoretical interpretation of the T Tauri stars, Rev. Mexicana Astr. Astrophys. 7, 151 (1983)
I. Appenzeller: The potential of a VLT for stellar astronomy, in: Proc. of the 1. Workshop on ESO's Very Large Telescope, ESO Workshop and Conference Proceedings 17, 7 (1983)
I. Appenzeller: Die Strahlungsentwicklung der Sonne in Vergangenheit und Zukunft, in: "Entstehung und Entwicklung der terrestrischen Planeten", Proc. 4. DFG Colloquium on Planetary Research, ed. P. Blum, p. 1 (1985)
I. Appenzeller: Contracting stars, Physica Scripta T 11, 76 (1985)
I. Appenzeller: Instability in massive stars, in: Proc. IAU Symposium 116, 139 (1986)
I. Appenzeller: High-resolution spectroscopy, in: Proc. Second Workshop on ESO's Very Large Telescope, eds. S. D'Odorico and J.P. Swings, ESO 1986, p. 93 (1986)
I. Appenzeller and C.L. Imhoff: Pre-main sequence stars, in: "Exploring the Universe with the IUE Satellite", ed. Y. Kondo, D. Reidel Publ., Dordrecht 1987, p. 295 (1987)
I. Appenzeller: Theory of vibrational instabilities in luminous early-type stars, in: "Instabilities in Luminous Early-type Stars", eds. H.J.G.L.M. Lamers and C.W.H. de Loore, D. Reidel Publ., Dordrecht 1987, p. 55 (1987)
I. Appenzeller: High S/N spectroscopy of pre-main sequence stars, in: Proc. IAU Symposium 132, 87 (1988)
I. Appenzeller: High resolution imaging and stellar physics, in: Proc. NOAO-ESO Conference on "High-resolution Imaging by Interferometry", ed. F. Merkle, ESO 1988, p. 19 (1988)
I. Appenzeller: Collimated flows from young objects, in: Proc. 4th IAP Astrophysics Meeting on "Modelling the Stellar Environment", ed. P. Delache et al., Edition Frontieres, Gif-sur-Yvette 1989, p. 47 (1989)
I. Appenzeller: The role of radiation pressure in: LBV atmospheres, in Proc. IAU Colloquium 113, eds. K. Davidson, A.F.P. Moffat and H. Lamers, Kluwer Publ., Dordrecht 1989, p. 195 (1989)
I. Appenzeller: Detectors and Receivers, in: Proc. EADN Astrophysics School I, eds. I. Appenzeller, H.J. Habing and P. Lena, Springer Lecture Notes in Physics 333, 299 (1989)
I. Appenzeller: Future directions and opportunities, in: Proc. ESO Workshop on "Low Mass Star Formation and Pre-main Sequence Objects", ed. B. Reipurth, ESO 1989, p. 491 (1989)
I. Appenzeller and R. Mundt: T Tauri stars, Astron. Astrophys. Reviews 1, 291 (1989)
I. Appenzeller: T Tauri stars and flare stars: Common properties and differences, in: Proc. IAU Symposium 137 ("Flare Stars"), 209 (1990)
I. Appenzeller: New developments, concepts and dreams, in: Proc. XI European Regional Astronomy Meeting, eds. F. Sanches and M. Vasques, Cambridge University Press 1990, p. 515 (1990)
I. Appenzeller: Herbig Ae/Be stars: The interface between low-mass and high-mass star formation, in: "The Nature and Evolutionary Status of Herbig Ae/Be Stars", eds. Pik Sin The et al., ASP Conference Series Vol 62, Astron. Soc. of the Pacific, San Francisco, 1994, p. 201
I. Appenzeller: Current problems in star formation and infrared surveys, in: "Science with Astronomical Near Infrared Surveys", eds. N. Epchtein et al. Kluwer, Dordrecht, 1994, p. 12
S. Moehler, I. Appenzeller, W. Seifert, B. Muschielok: The FORS Instrument for the ESO VLT, in: "Calibrating and understanding HST and ESO Instruments", ESO Conference and Workshop Proceeedings 53 (1995), p. 149
I. Appenzeller: Protostars and pre-main sequence objects, in: Landolt-Bornstein, Numerical Data and Functional Relationships for Science and Technology, VI-3B, ed. H.H. Voigt, Springer, Heidelberg -Berlin-New York, 1996, p. 196
I. Appenzeller, O. Stahl, S. Kiesewetter-K., R. P. Kudritzki, H. Nicklas, G. Rupprecht: Spectroscopy of Faint Distant Objects with FORS, in: "The Early Universe with the VLT", ed. J. Bergeron, ESO Astrophysics Symposia, Springer, Heidelberg, 1997, p.35
I. Appenzeller: The Demise of Spherical and Stationary Winds, in: Variable and Non-spherical Stellar Winds in Luminous Hot Stars, Proc. IAU Coll. No 169, eds. B. Wolf, O. Stahl, A. W. Fullerton, Springer Lecture Notes in Physics 523, 416 (1999)
I. Appenzeller, R. Bender, H. Boehnhardt, S. Cristiani, M. Dietrich, K. Fricke, W. Fuertig, W. Gaessler, R. Gilmozzi, R. Haefner, R. Harke, J. Heidt, H.-J. Hess, U. Hopp, W. Hummel, K. Jaeger, P. Juergens, R. P. Kudritzki, M. Kuemmel, K.-H. Mantel, D. Mehlert, W. Meisl, C. Moellenhoff, B. Muschielok, Nicklas, A. Renzini, P. Rosati, G. Rupprecht, R. Saglia, W. Seifert, S. Seitz, J. Spyromilio, O. Stahl, T. Szeifert, K. Tarantik, Science with FORS, in: "From Extrasolar Planets to Cosmology. The VLT Opening Symposium", ed. J. Bergeron, A. Renzini, ESO Astrophysics Symposia, Springer, Heidelberg (2000) p.3
Heidt, J., Appenzeller, I., Bender, R., et al.: The FORS Deep Field. Reviews of Modern Astronomy 14, 209 (2001)
I. Appenzeller: Das Very Large Telescope: Europas scharfes Auge fuer den Blick in die Vergangenheit des Kosmos. Physikalische Blaetter (Physik Journal) 57 (Nr. 10), p. 35 (2001)
I. Appenzeller, R. Bender, A. Boehm, S. Frank, K. Fricke, et al.: Exploring Cosmic Evolution with the FORS Deep Field. The Messenger, 116, 18 (2004)
I. Appenzeller: Die Entdeckung der kosmischen Expansion. Astronomie und Raumfahrt im Unterricht, 53, 6 (2016)
I. Appenzeller: Astrophysik im Goldenen Zeitalter. In "Heidelberger Physiker berichten", Vol. 3 (Mikrokosmos und Makrokosmos), p. 3, I. Appenzeller, D. Dubbers, H.-G. Siebig, A. Winnacker, eds., heibooks, Heidelberg 2017, available as e-book (see http://books.ub.uni-heidelberg.de/heibooks/catalog) or as printed version at bookstores.