Abarra, G. L., Lim, A. J., & Perez, D. (2001). A Methods engineering study on Samson Plastic Packaging and Contractual Services. College of Engineering.
Chicago-referens (17:e uppl.)Abarra, Geraldine L., Angelito Jr Lim, och Dianne Perez. A Methods Engineering Study on Samson Plastic Packaging and Contractual Services. Diliman, Quezon City: College of Engineering, 2001.
MLA-referens (9:e uppl.)Abarra, Geraldine L., et al. A Methods Engineering Study on Samson Plastic Packaging and Contractual Services. College of Engineering, 2001.
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