Castillo, A. O., Evaristo, A. G., & Uy, A. T. (1995). A Project feasibility study on gemstone processing. College of Engineering.
Lua i Stíl Chicago (17ú heag.)Castillo, Althea O., Alexander G. Evaristo, agus Alvin T. Uy. A Project Feasibility Study on Gemstone Processing. Diliman, Quezon City: College of Engineering, 1995.
Lua MLA (9ú heag.)Castillo, Althea O., et al. A Project Feasibility Study on Gemstone Processing. College of Engineering, 1995.
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