Cruz, A. C., Dayrit, N. M., & Yap, G. R. (1974). Content analysis of biology for philippine high schools: The relationships of living things, textbook and laboratory manual.
Chicago-referens (17:e uppl.)Cruz, Azucena C., Nenita M. Dayrit, och Guafdalupe R. Yap. Content Analysis of Biology for Philippine High Schools: The Relationships of Living Things, Textbook and Laboratory Manual. Quezon City, 1974.
MLA-referens (9:e uppl.)Cruz, Azucena C., et al. Content Analysis of Biology for Philippine High Schools: The Relationships of Living Things, Textbook and Laboratory Manual. 1974.
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