APA aipamena

Lucas, J., & McKennell, V. (1974). The Penguin book of playgroups. Penguin Books.

Chicago Style aipamena

Lucas, Joyce, and Vivienne McKennell. The Penguin Book of Playgroups. Harmondsworth ; Baltimore: Penguin Books, 1974.

MLA aipamena

Lucas, Joyce, and Vivienne McKennell. The Penguin Book of Playgroups. Penguin Books, 1974.