Beltran, A. (2001). A test development research: Liberalism questionnaire. University of the Philippines Diliman Extension Program in Pampanga.
Lua i Stíl Chicago (17ú heag.)Beltran, Aireen. A Test Development Research: Liberalism Questionnaire. Pampanga: University of the Philippines Diliman Extension Program in Pampanga, 2001.
Lua MLA (9ú heag.)Beltran, Aireen. A Test Development Research: Liberalism Questionnaire. University of the Philippines Diliman Extension Program in Pampanga, 2001.
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