APA-čujuhus (7. p.)
Eckhardt, K. W., & Erman, M. D. (1977). Social research methods: Perspective, theory and analysis. Random House.
Chicago-čujuhus (17. p.)
Eckhardt, Kenneth W., juo M. David Erman. Social Research Methods: Perspective, Theory and Analysis. New York: Random House, 1977.
MLA-čujuhus (9. p.)
Eckhardt, Kenneth W., juo M. David Erman. Social Research Methods: Perspective, Theory and Analysis. Random House, 1977.
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