Du, M., Garcia, C. D. C., & Macaspac, G. R. (1994). A Methods engineering study of Gonzalez Concrete Products. College of Engineering.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDu, Michaelangelo, Carlo Demetrius C. Garcia, और Glenn R. Macaspac. A Methods Engineering Study of Gonzalez Concrete Products. Diliman, Quezon City: College of Engineering, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDu, Michaelangelo, et al. A Methods Engineering Study of Gonzalez Concrete Products. College of Engineering, 1994.
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