Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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