Παραπομπή σε μορφή APA (7η εκδ.)

Folmer, H., & Gabel, H. L. (2000). Principles of environmental and resource economics: A guide for students and decision-makers. Edward Elgar.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Folmer, Henk, και H. Landis Gabel. Principles of Environmental and Resource Economics: A Guide for Students and Decision-makers. Cheltenham, UK: Edward Elgar, 2000.

Παραπομπή σε μορφή MLA (9th εκδ.)

Folmer, Henk, και H. Landis Gabel. Principles of Environmental and Resource Economics: A Guide for Students and Decision-makers. Edward Elgar, 2000.