Gay, L. R. (1987). Educational research: Competencies for analysis and application (3rd ed.). Merrill.
Lua i Stíl Chicago (17ú heag.)Gay, L. R. Educational Research: Competencies for Analysis and Application. 3rd ed. Columbus, Ohio: Merrill, 1987.
Lua MLA (9ú heag.)Gay, L. R. Educational Research: Competencies for Analysis and Application. 3rd ed. Merrill, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.