Παραπομπή σε μορφή APA (7η εκδ.)

Folmer, H., Gabel, H. L., & Opschoor, J. B. (1995). Principles of environmental and resource economics: A guide for students and decision-makers. Edward Elgar.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Folmer, Henk, H. Landis Gabel, και Johannes B. Opschoor. Principles of Environmental and Resource Economics: A Guide for Students and Decision-makers. Aldershot: Edward Elgar, 1995.

Παραπομπή σε μορφή MLA (9th εκδ.)

Folmer, Henk, et al. Principles of Environmental and Resource Economics: A Guide for Students and Decision-makers. Edward Elgar, 1995.