توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

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.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

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.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

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.