Singleton, R., Straits,Bruce C, & Straits,Margaret Miller. (1993). Approaches to social research (2nd ed.). Oxford University press.
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Chicago-čujuhus (17. p.)
Singleton, Royce, Straits,Bruce C, juo Straits,Margaret Miller. Approaches to Social Research. 2nd ed. New York: Oxford University press, 1993.
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MLA-čujuhus (9. p.)
Singleton, Royce, et al. Approaches to Social Research. 2nd ed. Oxford University press, 1993.
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