Chico, E. T. (2009). Operating system and office applications: Teacher's manual (2nd ed.). Vibal Publishing House.
Lua i Stíl Chicago (17ú heag.)Chico, Estrella T. Operating System and Office Applications: Teacher's Manual. 2nd ed. Quezon City, Phils: Vibal Publishing House, 2009.
Lua MLA (9ú heag.)Chico, Estrella T. Operating System and Office Applications: Teacher's Manual. 2nd ed. Vibal Publishing House, 2009.
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