Willems, M. (2011). Happy Pig Day! Hyperion Books for Children.
Lua i Stíl Chicago (17ú heag.)Willems, Mo. Happy Pig Day! New York: Hyperion Books for Children, 2011.
Lua MLA (8ú heag.)Willems, Mo. Happy Pig Day! Hyperion Books for Children, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.