APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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