Wendy Pfeffer. (2003). Wiggling Worms at Work (Let's-Read-and-Find-Out Science 2) (1.). HarperCollins.
Lua i Stíl Chicago (17ú heag.)Wendy Pfeffer. Wiggling Worms at Work (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 2003.
Lua MLA (9ú heag.)Wendy Pfeffer. Wiggling Worms at Work (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.