Abarra, G. L., Lim, A. J., & Perez, D. (2001). A Methods engineering study on Samson Plastic Packaging and Contractual Services. College of Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAbarra, Geraldine L., Angelito Jr Lim, और Dianne Perez. A Methods Engineering Study on Samson Plastic Packaging and Contractual Services. Diliman, Quezon City: College of Engineering, 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAbarra, Geraldine L., et al. A Methods Engineering Study on Samson Plastic Packaging and Contractual Services. College of Engineering, 2001.
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