WATKINS CHARLEY. (2002). MARKETING SALES AND CUSTOMER SERVICES. AITBS PUBLICATION.
Lua i Stíl Chicago (17ú heag.)WATKINS CHARLEY. MARKETING SALES AND CUSTOMER SERVICES. NEW DELHI: AITBS PUBLICATION, 2002.
Lua MLA (9ú heag.)WATKINS CHARLEY. MARKETING SALES AND CUSTOMER SERVICES. AITBS PUBLICATION, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.