APA (7th ed.) Citation

Van der Eyken, W. (1967). The pre-school years. Penguin Books.

Chicago Style (17th ed.) Citation

Van der Eyken, Willem. The Pre-school Years. Harmondsworth, Mx: Penguin Books, 1967.

MLA (9th ed.) Citation

Van der Eyken, Willem. The Pre-school Years. Penguin Books, 1967.

Warning: These citations may not always be 100% accurate.