Ibarra, M. C. A., Leung, M. F. P., & Magpili, L. M. M. (1992). A Work study on Playpen Export Philippines. College of Engineering.
Citace podle Chicago (17th ed.)Ibarra, Ma. Celeste A., Ma. Felicia P. Leung, a Luna Mylene M. Magpili. A Work Study on Playpen Export Philippines. Diliman, Quezon City: College of Engineering, 1992.
Citace podle MLA (9th ed.)Ibarra, Ma. Celeste A., et al. A Work Study on Playpen Export Philippines. College of Engineering, 1992.
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