APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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