Saffer, B. (1999). Science questions & answers: The ocean :for ages 6-8. Lowell House Juvenile.
Lua i Stíl Chicago (17ú heag.)Saffer, Barbara. Science Questions & Answers: The Ocean :for Ages 6-8. Los Angeles: Lowell House Juvenile, 1999.
Lua MLA (8ú heag.)Saffer, Barbara. Science Questions & Answers: The Ocean :for Ages 6-8. Lowell House Juvenile, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.