Labovitz, S., & Hagedorn, R. (1971). Introduction to social research (2nd ed.). McGraw - Hill.
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Chicago-čujuhus (17. p.)
Labovitz, Sanford, juo Robert Hagedorn. Introduction to Social Research. 2nd ed. New York: McGraw - Hill, 1971.
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MLA-čujuhus (9. p.)
Labovitz, Sanford, juo Robert Hagedorn. Introduction to Social Research. 2nd ed. McGraw - Hill, 1971.
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