Doby, J. T. (1954). An introduction to social research. The Stackpole Company.
Lua i Stíl Chicago (17ú heag.)Doby, John T. An Introduction to Social Research. Harrisburg, Pennsylvania: The Stackpole Company, 1954.
Lua MLA (8ú heag.)Doby, John T. An Introduction to Social Research. The Stackpole Company, 1954.
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