Alampay, E. G., Gan, K., & Lacanaria, S. (1991). An Information Systems Study on TRENDS, Inc. College of Engineering.
Lua i Stíl Chicago (17ú heag.)Alampay, Erwin G., Kerstin Gan, agus Sofia Lacanaria. An Information Systems Study on TRENDS, Inc. Diliman, Quezon City: College of Engineering, 1991.
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