Association of Geoscientists for International Development & Ricaldi, V. H. (1978). Directory of geoscience departments in universities in developing countries: 1977. Association of Geoscientists for International Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Association of Geoscientists for International Development و Victor Hugo Ricaldi. Directory of Geoscience Departments in Universities in Developing Countries: 1977. St. John's, Newfoundland: Association of Geoscientists for International Development, 1978.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Association of Geoscientists for International Development و Victor Hugo Ricaldi. Directory of Geoscience Departments in Universities in Developing Countries: 1977. Association of Geoscientists for International Development, 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.