Padilla, T., Yap, J. A., Deligente, E., Sta. Ines, M., & Onggue, N. L. (1984). A Project study on the manufacture of rubber and leather balls. College of Engineering.
Lua i Stíl Chicago (17ú heag.)Padilla, Timoteo, James April Yap, Estelita Deligente, Manuel Sta. Ines, agus Noel Lyndon Onggue. A Project Study on the Manufacture of Rubber and Leather Balls. Diliman, Quezon City: College of Engineering, 1984.
Lua MLA (9ú heag.)Padilla, Timoteo, et al. A Project Study on the Manufacture of Rubber and Leather Balls. College of Engineering, 1984.
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