Παραπομπή σε μορφή APA (7η εκδ.)

Sierra Club International Earthcare Center. (1980). Environmental studies and natural resource management: An annotated guide to University and Government Training Programs in the United States. UNIPUB.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sierra Club International Earthcare Center. Environmental Studies and Natural Resource Management: An Annotated Guide to University and Government Training Programs in the United States. New York: UNIPUB, 1980.

Παραπομπή σε μορφή MLA (9th εκδ.)

Sierra Club International Earthcare Center. Environmental Studies and Natural Resource Management: An Annotated Guide to University and Government Training Programs in the United States. UNIPUB, 1980.