Bautista & Lirios, C. (1991). The Photocopy service system in the College of Engineering. College of Engineering.
Chicago-referens (17:e uppl.)Bautista och Chit Lirios. The Photocopy Service System in the College of Engineering. Diliman, Quezon City: College of Engineering, 1991.
MLA-referens (9:e uppl.)Bautista och Chit Lirios. The Photocopy Service System in the College of Engineering. College of Engineering, 1991.
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