Reyes, R. R., Sanchez, R., & Velasquez, G. (2001). A Methods engineering study on Imperial Plastic Manufacturing Company. College of Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रReyes, Richmond Ryan, Richard Sanchez, और Gabriel Velasquez. A Methods Engineering Study on Imperial Plastic Manufacturing Company. Diliman, Quezon City: College of Engineering, 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रReyes, Richmond Ryan, et al. A Methods Engineering Study on Imperial Plastic Manufacturing Company. College of Engineering, 2001.
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