Gaya APA
Köhler, W. (1975).
Gesaltpsychology: An introduction to new concepts in modern psychology. .
New York:
New York New American Library.
Gaya MLA
Köhler, Wolfgang.
"Gesaltpsychology: An introduction to new concepts in modern psychology. ".
New York:
New York New American Library,
1975.
Buku.