Köhler, W. (1938). The place of value in a world of facts: By Wolfgang Köhler. Liveright Publ..
Lua i Stíl Chicago (17ú heag.)Köhler, Wolfgang. The Place of Value in a World of Facts: By Wolfgang Köhler. New York: Liveright Publ., 1938.
Lua MLA (8ú heag.)Köhler, Wolfgang. The Place of Value in a World of Facts: By Wolfgang Köhler. Liveright Publ., 1938.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.