Cita APA (7th ed.)

Van Der Eyken, W. (1974). The pre-school years (3rd ed.). Penguin Education.

Cita Chicago (17th ed.)

Van Der Eyken, Willem. The Pre-school Years. 3rd ed. Hammondsworth: Penguin Education, 1974.

Cita MLA (9th ed.)

Van Der Eyken, Willem. The Pre-school Years. 3rd ed. Penguin Education, 1974.