Chhatwal, G. (1994). Encyclopaedic history of science and technology.: History of Biology. Anmol publications.
Lua i Stíl Chicago (17ú heag.)Chhatwal, G.R. Encyclopaedic History of Science and Technology.: History of Biology. New Delhi: Anmol publications, 1994.
Lua MLA (9ú heag.)Chhatwal, G.R. Encyclopaedic History of Science and Technology.: History of Biology. Anmol publications, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.