PURVES, W. K., & ORIANS, G. H. (1983). Life: The science of biology. Sinauer Associates Williard Grant Press.
Lua i Stíl Chicago (17ú heag.)PURVES, William K., agus Gordon H. ORIANS. Life: The Science of Biology. Sunderland: Sinauer Associates Williard Grant Press, 1983.
Lua MLA (9ú heag.)PURVES, William K., agus Gordon H. ORIANS. Life: The Science of Biology. Sinauer Associates Williard Grant Press, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.