George, J. D. (1979). Marine life: An illustrated encyclopedia of invertebrates in the sea. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)George, J. David. Marine Life: An Illustrated Encyclopedia of Invertebrates in the Sea. John Wiley and Sons, 1979.
Lua MLA (9ú heag.)George, J. David. Marine Life: An Illustrated Encyclopedia of Invertebrates in the Sea. John Wiley and Sons, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.