SEKARAN UMA. (2008). RESEARCH METHODS FOR BUSINESS A SKILL BUILDING APPROACH (4TH.). JOHN WILEY AND SONS LTD.
Chicago Style aipamenaSEKARAN UMA. RESEARCH METHODS FOR BUSINESS A SKILL BUILDING APPROACH. 4TH. NEW DELHI: JOHN WILEY AND SONS LTD, 2008.
MLA aipamenaSEKARAN UMA. RESEARCH METHODS FOR BUSINESS A SKILL BUILDING APPROACH. 4TH. JOHN WILEY AND SONS LTD, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.