Arriola, P. M. (1991). Materials monitoring system. College of Engineering.
Lua i Stíl Chicago (17ú heag.)Arriola, Portia M. Materials Monitoring System. Diliman, Quezon City: College of Engineering, 1991.
Lua MLA (9ú heag.)Arriola, Portia M. Materials Monitoring System. College of Engineering, 1991.
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