Παραπομπή σε μορφή APA (7η εκδ.)

Nicholls, Y. I. (1973). Source book: Emergence of proposals for recompensing developing countries for maintaining environmental quality. International Union for Conservation of Nature and Natural Resources.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Nicholls, Yvonne I. Source Book: Emergence of Proposals for Recompensing Developing Countries for Maintaining Environmental Quality. Switzerland: International Union for Conservation of Nature and Natural Resources, 1973.

Παραπομπή σε μορφή MLA (9th εκδ.)

Nicholls, Yvonne I. Source Book: Emergence of Proposals for Recompensing Developing Countries for Maintaining Environmental Quality. International Union for Conservation of Nature and Natural Resources, 1973.