Ardales, V. B. (1992). Basic concepts and methods in research. Great Books Trading.
Lua i Stíl Chicago (17ú heag.)Ardales, Venancio B. Basic Concepts and Methods in Research. Quezon City: Great Books Trading, 1992.
Lua MLA (9ú heag.)Ardales, Venancio B. Basic Concepts and Methods in Research. Great Books Trading, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.