Berg, B. L. (1989). Qualitative research methods for the social sciences. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Berg, Bruce L. Qualitative Research Methods for the Social Sciences. Boston: Allyn and Bacon, 1989.
Lua MLA (8ú heag.)Berg, Bruce L. Qualitative Research Methods for the Social Sciences. Allyn and Bacon, 1989.
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