Παραπομπή σε μορφή APA (7η εκδ.)

Halvorsen, R., & Layton, D. F. (2006). Explorations in environmental and natural resource economics: Essays in honor of Gardner M. Brown, Jr. Edward Elgar Pub..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Halvorsen, Robert, και David F. Layton. Explorations in Environmental and Natural Resource Economics: Essays in Honor of Gardner M. Brown, Jr. Cheltenham, UK: Edward Elgar Pub., 2006.

Παραπομπή σε μορφή MLA (9th εκδ.)

Halvorsen, Robert, και David F. Layton. Explorations in Environmental and Natural Resource Economics: Essays in Honor of Gardner M. Brown, Jr. Edward Elgar Pub., 2006.