Cohen, L. (1994). Research methods in education (4th ed.). Routledge.
Chicago-čujuhus (17. p.)Cohen, Louis. Research Methods in Education. 4th ed. London: Routledge, 1994.
MLA-čujuhus (9. p.)Cohen, Louis. Research Methods in Education. 4th ed. Routledge, 1994.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.