JOSEPH DAVID. (1989). MARKETING PLUS A POSITIVE APPROACH TO TOTAL MARKETING. HEINEMANN.
Lua i Stíl Chicago (17ú heag.)JOSEPH DAVID. MARKETING PLUS A POSITIVE APPROACH TO TOTAL MARKETING. OXFORD: HEINEMANN, 1989.
Lua MLA (9ú heag.)JOSEPH DAVID. MARKETING PLUS A POSITIVE APPROACH TO TOTAL MARKETING. HEINEMANN, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.