Schutt, R. K. Investigating the social world: The process and practice of research (Ninth edition.).
Lua i Stíl Chicago (17ú heag.)Schutt, Russell K. Investigating the Social World: The Process and Practice of Research. Ninth edition.
Lua MLA (9ú heag.)Schutt, Russell K. Investigating the Social World: The Process and Practice of Research. Ninth edition.
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