APA (7th ed.) Zitazioa
Wertheimer, M. (1959). Productive thinking (enlarged ed.). Harper & Brothers publishers.
Chicago Style (17th ed.) Zitazioa
Wertheimer, Max. Productive Thinking. enlarged ed. New York: Harper & Brothers publishers, 1959.
MLA (9th ed.) Zitazioa
Wertheimer, Max. Productive Thinking. enlarged ed. Harper & Brothers publishers, 1959.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.