Apthorpe, R. The UNDP assistance 1968-1974 to the Institute of Planning, the University of the Philippines: A record and a review by a participant.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Apthorpe, Raymond. The UNDP Assistance 1968-1974 to the Institute of Planning, the University of the Philippines: A Record and a Review by a Participant.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Apthorpe, Raymond. The UNDP Assistance 1968-1974 to the Institute of Planning, the University of the Philippines: A Record and a Review by a Participant.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.