HARVARD BUSINESS REVIEW. (1991). SHARPENING THE MARKETING EDGE. HBR LIBRARY.
Čikaški stil citiranja (17. izdanje)HARVARD BUSINESS REVIEW. SHARPENING THE MARKETING EDGE. AMI MUMBAI: HBR LIBRARY, 1991.
MLA način citiranja (9. izdanje)HARVARD BUSINESS REVIEW. SHARPENING THE MARKETING EDGE. HBR LIBRARY, 1991.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.