ZIKMUND WILLIAM G. (2008). BUSINESS RESEARCH METHODS 7TH ED (7TH ED.). SOUTH-WESTERN COLLEGE PUBLISHING CO.
Lua i Stíl Chicago (17ú heag.)ZIKMUND WILLIAM G. BUSINESS RESEARCH METHODS 7TH ED. 7TH ED. AUSTRALIA: SOUTH-WESTERN COLLEGE PUBLISHING CO, 2008.
Lua MLA (9ú heag.)ZIKMUND WILLIAM G. BUSINESS RESEARCH METHODS 7TH ED. 7TH ED. SOUTH-WESTERN COLLEGE PUBLISHING CO, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.