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Lua i Stíl Chicago (17ú heag.)Alcasabas, Ramon Manolo A., Vincent Paul Y. Cariaga, Sherilyn U. Eiaw, Elton Cris E. Irong, agus Ofelia E. Uy. A Feasibility Study on Speltix Electronix, Inc: Printed Circuit Boards. Diliman, Quezon City: College of Engineering, 1999.
Lua MLA (9ú heag.)Alcasabas, Ramon Manolo A., et al. A Feasibility Study on Speltix Electronix, Inc: Printed Circuit Boards. College of Engineering, 1999.
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