Mertler, C. A., & Charles, C. M. (2008). Introduction to educational research (Sixth edition.). Pearson Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Mertler, Craig A., agus C. M. Charles. Introduction to Educational Research. Sixth edition. Boston, MA: Pearson Allyn and Bacon, 2008.
Lua MLA (9ú heag.)Mertler, Craig A., agus C. M. Charles. Introduction to Educational Research. Sixth edition. Pearson Allyn and Bacon, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.