De Vera, A. F., Wang, T., & Traya, L. A. (1992). An Information system study of the SPMO Procurement Section. College of Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDe Vera, Augusto Francis, Ting Wang, और Lloyd Apollo Traya. An Information System Study of the SPMO Procurement Section. Diliman, Quezon City: College of Engineering, 1992.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDe Vera, Augusto Francis, et al. An Information System Study of the SPMO Procurement Section. College of Engineering, 1992.
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