Alampay, E., Lacanaria, S., Escano, M., Mamutuk, N. R., & Valera, J. (1987). Methods study on United Industrial Bag Company Inc. College of Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAlampay, Erwin, Sofia Lacanaria, Marco Escano, Nattalie R. Mamutuk, और Jasmin Valera. Methods Study on United Industrial Bag Company Inc. Diliman, Quezon City: College of Engineering, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAlampay, Erwin, et al. Methods Study on United Industrial Bag Company Inc. College of Engineering, 1987.
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