Παραπομπή σε μορφή APA (7η εκδ.)

Hussen, A. M. (2004). Principles of environmental economics: Economy, ecology and public policy (2nd ed.). Routledge.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hussen, Ahmed M. Principles of Environmental Economics: Economy, Ecology and Public Policy. 2nd ed. London: Routledge, 2004.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hussen, Ahmed M. Principles of Environmental Economics: Economy, Ecology and Public Policy. 2nd ed. Routledge, 2004.