Schindler, . P. S. S. (2012). Business Research Methods Cooper, Donald R (11 ed.). Tata McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Schindler, Pamela S; Sharma. Business Research Methods Cooper, Donald R. 11 ed. New Delhi: Tata McGraw Hill, 2012.
Lua MLA (9ú heag.)Schindler, Pamela S; Sharma. Business Research Methods Cooper, Donald R. 11 ed. Tata McGraw Hill, 2012.
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