Henkes, K., & Lobel, A. (2005). So happy! Greenwillow Books.
Lua i Stíl Chicago (17ú heag.)Henkes, Kevin, agus Anita Lobel. So Happy! [New York]: Greenwillow Books, 2005.
Lua MLA (8ú heag.)Henkes, Kevin, agus Anita Lobel. So Happy! Greenwillow Books, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.