Παραπομπή APA
Black, J. A., & Champion, D. J. (1976). Methods and issues in social research. New york: John Wiley & Sons.
Παραπομπή Chicago StyleBlack, James A., and Dean J. Champion. Methods and Issues in Social Research. New york: John Wiley & Sons, 1976.
Παραπομπή MLABlack, James A., and Dean J. Champion. Methods and Issues in Social Research. New york: John Wiley & Sons, 1976.
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