Ardales, V. B. (1992). Basic concepts and methods in research. Great Books Trading.
Chicago-viite (17. p.)Ardales, Venancio B. Basic Concepts and Methods in Research. Quezon City: Great Books Trading, 1992.
MLA-viite (9. p.)Ardales, Venancio B. Basic Concepts and Methods in Research. Great Books Trading, 1992.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.