Wolfgang Köhler: (1929): An old pseudoproblem
- Wolfgang Kohler, one of the founders of Gestalt psychology, explicates the epistemological position of Gestalt psychology in this article.
- http://www.gestalttheory.net/archive/kohl1.html

A.S. Luchins & E.H. Luchins: Isomorphism in Gestalt theory
- Comparison of Wertheimer's and Koehler's concepts; by Abraham S. Luchins and Edith H. Luchins (1999)
- http://www.gestalttheory.net/archive/luch_iso1.html

Kohler's objections to Thorndike's Puzzle Box approach
- Excerpted from Wolfgang's Kohler's book The Mentality of Apes (1925).
- http://www.pigeon.psy.tufts.edu/psych26/kohler1.htm

Wolfgang Köhler
- Short bio and suggestions for further information.
- http://www.kirjasto.sci.fi/kohler.htm

Introduction to Wolfgang Kohler: Mentality of Apes
- Excerpted from Wolfgang's Kohler's book The Mentality of Apes (1925).
- http://www.pigeon.psy.tufts.edu/psych26/kohler2.htm

Kohler's Work on Insight Learning
- brief excerpt on Kohler's research from the book: The Animal Mind by J.L Gould & C. G. Gould
- http://www.pigeon.psy.tufts.edu/psych26/kohler.htm