APA(7版)引用形式

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

Chicagoスタイル(17版)引用形式

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

MLA(8版)引用形式

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