APA-referens

(Firm), P. (1997). The Guide to graduate environmental programs. Washington, D.C.

Chicago-stil citat

(Firm), ProQuest. The Guide to Graduate Environmental Programs. Washington, D.C, 1997.

MLA-referens

(Firm), ProQuest. The Guide to Graduate Environmental Programs. Washington, D.C, 1997.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.