APA-viite (7. p.)

Willems, M. (2011). Happy Pig Day! Hyperion Books for Children.

Chicago-viite (17. p.)

Willems, Mo. Happy Pig Day! New York: Hyperion Books for Children, 2011.

MLA-viite (8. p.)

Willems, Mo. Happy Pig Day! Hyperion Books for Children, 2011.