» 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

» 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 and C. G. Gould    http://www.pigeon.psy.tufts.edu/psych26/kohler.htm

» 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

» 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