Dela Peña, F. T. (1981). A framework for the organization of research and development activities in engineering and related fields. Philippine Engineering Journal.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Dela Peña, Fortunato T. "A Framework for the Organization of Research and Development Activities in Engineering and Related Fields." Philippine Engineering Journal 1981.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Dela Peña, Fortunato T. "A Framework for the Organization of Research and Development Activities in Engineering and Related Fields." Philippine Engineering Journal, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.