Mertler, C. A., & Charles, C. M. (2005). Introduction to educational research (5th ed.). Pearson/Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Mertler, Craig A., agus C. M. Charles. Introduction to Educational Research. 5th ed. Boston: Pearson/Allyn and Bacon, 2005.
Lua MLA (9ú heag.)Mertler, Craig A., agus C. M. Charles. Introduction to Educational Research. 5th ed. Pearson/Allyn and Bacon, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.