Ardales, V. B. (1992). Basic concepts and methods in research. Great Books Trading.
Citazione stile Chigago Style (17a edizione)Ardales, Venancio B. Basic Concepts and Methods in Research. Quezon City: Great Books Trading, 1992.
Citatione MLA (9a ed.)Ardales, Venancio B. Basic Concepts and Methods in Research. Great Books Trading, 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.