Neuman, W. L. (2006). Social research methods: Qualitative and quantitative approaches (6th ed.). Pearson/AandB.
Lua i Stíl Chicago (17ú heag.)Neuman, William Lawrence. Social Research Methods: Qualitative and Quantitative Approaches. 6th ed. Boston: Pearson/AandB, 2006.
Lua MLA (8ú heag.)Neuman, William Lawrence. Social Research Methods: Qualitative and Quantitative Approaches. 6th ed. Pearson/AandB, 2006.
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