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.
Atenció: Aquestes cites poden no estar 100% correctes.