Παραπομπή σε μορφή APA (7η εκδ.)

Sierra Club International Earthcare Center. (1983). Directory of U.S. college and university programs in environmental studies and natural resources management. UNIPUB.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sierra Club International Earthcare Center. Directory of U.S. College and University Programs in Environmental Studies and Natural Resources Management. New York: UNIPUB, 1983.

Παραπομπή σε μορφή MLA (9th εκδ.)

Sierra Club International Earthcare Center. Directory of U.S. College and University Programs in Environmental Studies and Natural Resources Management. UNIPUB, 1983.