Dyfyniad APA

Delvin, S. (2007). environmental problems and issues. Sarup.

Dyfyniad Arddull Chicago

Delvin, Samuel. Environmental Problems and Issues. New Delhi: Sarup, 2007.

Dyfyniad MLA

Delvin, Samuel. Environmental Problems and Issues. Sarup, 2007.

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