Gurdeep Raj & Trivedi, P. R. (1998). Environmental biology.
Chicago Edition CitationGurdeep Raj and P R. Trivedi. Environmental Biology. New delhi, Akash deep publishing house, 1998.
MLA Edition CitationGurdeep Raj and P R. Trivedi. Environmental Biology. 1998.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.