APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (8. p.)

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