Cita APA (7th ed.)

Kluwe, R., & Spada, H. (1980). Developmental models of thinking. Academic Press.

Cita Chicago (17th ed.)

Kluwe, Rainer, i Hans Spada. Developmental Models of Thinking. New York: Academic Press, 1980.

Cita MLA (9th ed.)

Kluwe, Rainer, i Hans Spada. Developmental Models of Thinking. Academic Press, 1980.