Kothari, C. (2019). Research Methodology (4th.). New Age International.
Lua i Stíl Chicago (17ú heag.)Kothari, C.R. Research Methodology. 4th. New Age International, 2019.
Lua MLA (9ú heag.)Kothari, C.R. Research Methodology. 4th. New Age International, 2019.
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