PATTON MICHAEL QUINN. (2002). QUALITATIVE RESEARCH & EVALUATION METHODS (3RD.). SAGE PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)PATTON MICHAEL QUINN. QUALITATIVE RESEARCH & EVALUATION METHODS. 3RD. LONDON: SAGE PUBLICATIONS, 2002.
Lua MLA (9ú heag.)PATTON MICHAEL QUINN. QUALITATIVE RESEARCH & EVALUATION METHODS. 3RD. SAGE PUBLICATIONS, 2002.
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