Dela Paz, R. C., Estrada, E. D., & Remata, E. N. (1999). Quality system study on St. Paul's Printing Press. College of Engineering.
Lua i Stíl Chicago (17ú heag.)Dela Paz, Rupher C., Eric D.C Estrada, agus Eugene N. Remata. Quality System Study on St. Paul's Printing Press. Diliman, Quezon City: College of Engineering, 1999.
Lua MLA (9ú heag.)Dela Paz, Rupher C., et al. Quality System Study on St. Paul's Printing Press. College of Engineering, 1999.
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