Cita APA (7th ed.)

Van der Eyken, W. (1977). The pre-school years (4th ed.). Penguin.

Cita Chicago (17th ed.)

Van der Eyken, Willem. The Pre-school Years. 4th ed. Harmondsworth ; New York: Penguin, 1977.

Cita MLA (8th ed.)

Van der Eyken, Willem. The Pre-school Years. 4th ed. Penguin, 1977.