Cooper, D. R. S. (2012). Business Research Methods (11th ed.). McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Cooper, Donald R; Schindler. Business Research Methods. 11th ed. New Delhi: McGraw Hill, 2012.
Lua MLA (9ú heag.)Cooper, Donald R; Schindler. Business Research Methods. 11th ed. McGraw Hill, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.