Ardales, V. B. (1992). Basic concepts and methods in research. Great Books Trading.
Chicago Style aipamenaArdales, Venancio B. Basic Concepts and Methods in Research. Quezon City: Great Books Trading, 1992.
MLA aipamenaArdales, Venancio B. Basic Concepts and Methods in Research. Great Books Trading, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.