DOUGLAS, S. P. (1995). Global Marketing Strategy. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)DOUGLAS, Susan P. Global Marketing Strategy. McGraw-Hill, 1995.
Lua MLA (8ú heag.)DOUGLAS, Susan P. Global Marketing Strategy. McGraw-Hill, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.