Ocampo, S., Daway, R. D., Panergo, M., & Rodriguez, F. (2004). A Methods engineering study on Union Refinery Corporation. College of Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOcampo, Shierly, Rhey David Daway, Mildred Panergo, और Federico Rodriguez. A Methods Engineering Study on Union Refinery Corporation. Diliman, Quezon City: College of Engineering, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रOcampo, Shierly, et al. A Methods Engineering Study on Union Refinery Corporation. College of Engineering, 2004.
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