United Nations Institute for Training and Research. (1971). The brain drain from five developing countries: Cameroon-Colombia-Lebanon-Philippines-Trinidad and Tobago. [s.n.].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United Nations Institute for Training and Research. The Brain Drain from Five Developing Countries: Cameroon-Colombia-Lebanon-Philippines-Trinidad and Tobago. New York: [s.n.], 1971.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)United Nations Institute for Training and Research. The Brain Drain from Five Developing Countries: Cameroon-Colombia-Lebanon-Philippines-Trinidad and Tobago. [s.n.], 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.