Cohen, L. (1994). Research methods in education (4th ed.). Routledge.
Chicago Style (17th ed.) ZitazioaCohen, Louis. Research Methods in Education. 4th ed. London: Routledge, 1994.
MLA (9th ed.) ZitazioaCohen, Louis. Research Methods in Education. 4th ed. Routledge, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.