Cohen, L., Manion, L., & Morrison, K. (2007). Research methods in education (6th ed.). Routledge.
Chicago-viite (17. p.)Cohen, Louis, Lawrence Manion, ja Keith Morrison. Research Methods in Education. 6th ed. London: Routledge, 2007.
MLA-viite (9. p.)Cohen, Louis, et al. Research Methods in Education. 6th ed. Routledge, 2007.
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