Chopra.J.K. (2004). Problems of Research in Public Administration. Common Wealth Publishers.
Lua i Stíl Chicago (17ú heag.)Chopra.J.K. Problems of Research in Public Administration. New Delhi: Common Wealth Publishers, 2004.
Lua MLA (9ú heag.)Chopra.J.K. Problems of Research in Public Administration. Common Wealth Publishers, 2004.
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