International Union for Conservation of Nature and Natural Resources & International Union for Conservation of Nature and Natural Resources. (1961). IUCN bulletin. International Union for Conservation of Nature and Natural Resources.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Union for Conservation of Nature and Natural Resources و International Union for Conservation of Nature and Natural Resources. IUCN Bulletin. Morges, Switzerland: International Union for Conservation of Nature and Natural Resources, 1961.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Union for Conservation of Nature and Natural Resources و International Union for Conservation of Nature and Natural Resources. IUCN Bulletin. International Union for Conservation of Nature and Natural Resources, 1961.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.