Schutt, R. K. (1999). Investigating the social world: The process and practice of research (2nd ed.). Pine Forge Press.
Lua i Stíl Chicago (17ú heag.)Schutt, Russell K. Investigating the Social World: The Process and Practice of Research. 2nd ed. Thousand Oaks, Calif: Pine Forge Press, 1999.
Lua MLA (9ú heag.)Schutt, Russell K. Investigating the Social World: The Process and Practice of Research. 2nd ed. Pine Forge Press, 1999.
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