Wendy Wax. (2007). Piggley Makes a Friend (Ready-to-Read. Level 1). Simon Spotlight.
Lua i Stíl Chicago (17ú heag.)Wendy Wax. Piggley Makes a Friend (Ready-to-Read. Level 1). Simon Spotlight, 2007.
Lua MLA (9ú heag.)Wendy Wax. Piggley Makes a Friend (Ready-to-Read. Level 1). Simon Spotlight, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.