APA (7 वां संस्करण) प्रशस्ति पत्र

Valenzuela, M., Villegas, M. G., & Zenarosa, C. J. L. (1991). A Work study on Judy Philippines, Inc. College of Engineering.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Valenzuela, Martin, Michael G. Villegas, और Carlo Jose L. Zenarosa. A Work Study on Judy Philippines, Inc. Diliman, Quezon City: College of Engineering, 1991.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Valenzuela, Martin, et al. A Work Study on Judy Philippines, Inc. College of Engineering, 1991.