SMITH, E. T. (1951). Exploring Biology. Harcourt Brace.
Lua i Stíl Chicago (17ú heag.)SMITH, Ella Thea. Exploring Biology. Harcourt Brace, 1951.
Lua MLA (8ú heag.)SMITH, Ella Thea. Exploring Biology. Harcourt Brace, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.