Cohen, L., Manion, L., & Morrison, K. (2007). Research methods in education (6th ed.). Routledge.
Lua i Stíl Chicago (17ú heag.)Cohen, Louis, Lawrence Manion, agus Keith Morrison. Research Methods in Education. 6th ed. London: Routledge, 2007.
Lua MLA (9ú heag.)Cohen, Louis, et al. Research Methods in Education. 6th ed. Routledge, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.