APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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