Dyfyniad APA

Gurdeep Raj & Trivedi, P. R. (1998). Environmental biology.

Dyfyniad Arddull Chicago

Gurdeep Raj and P R. Trivedi. Environmental Biology. New delhi, Akash deep publishing house, 1998.

Dyfyniad MLA

Gurdeep Raj and P R. Trivedi. Environmental Biology. 1998.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.