Citazione Stile APA (7a Edizione)

Wertheimer, M. (1959). Productive thinking (enlarged ed.). Harper & Brothers publishers.

Citazione stile Chigago Style (17a edizione)

Wertheimer, Max. Productive Thinking. enlarged ed. New York: Harper & Brothers publishers, 1959.

Citatione MLA (9a ed.)

Wertheimer, Max. Productive Thinking. enlarged ed. Harper & Brothers publishers, 1959.