Dyfyniad APA

Singh, Y. K. (2006). Environmental science. New Age International (P) Ltd., Publishers.

Dyfyniad Arddull Chicago

Singh, Y. K. Environmental Science. New Delhi: New Age International (P) Ltd., Publishers, 2006.

Dyfyniad MLA

Singh, Y. K. Environmental Science. New Age International (P) Ltd., Publishers, 2006.

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