Gonzales, C., Herrera, E., Panganiban, A., & Sabareza, G. (1998). Ramtread Quality Study: Ramcar Tire Corporation. College of Engineering.
Lua i Stíl Chicago (17ú heag.)Gonzales, Cesar, Eric Herrera, Annabelle Panganiban, agus Genaline Sabareza. Ramtread Quality Study: Ramcar Tire Corporation. Diliman, Quezon City: College of Engineering, 1998.
Lua MLA (9ú heag.)Gonzales, Cesar, et al. Ramtread Quality Study: Ramcar Tire Corporation. College of Engineering, 1998.
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