WILKINSON T S. (1984). METHODOLOGY AND TECHNIQUES OF SOCIAL RESEARCH (4TH.). HIMALAYA PUBLISHING HOUSE.
Lua i Stíl Chicago (17ú heag.)WILKINSON T S. METHODOLOGY AND TECHNIQUES OF SOCIAL RESEARCH. 4TH. MUMBAI: HIMALAYA PUBLISHING HOUSE, 1984.
Lua MLA (9ú heag.)WILKINSON T S. METHODOLOGY AND TECHNIQUES OF SOCIAL RESEARCH. 4TH. HIMALAYA PUBLISHING HOUSE, 1984.
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