GRIFFIN JILL. (2002). CUSTOMER LOYALTY: HOW TO EARN IT, HOW TO KEEP IT. JOSSEY-BASS PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)GRIFFIN JILL. CUSTOMER LOYALTY: HOW TO EARN IT, HOW TO KEEP IT. SAN FRANCISCO: JOSSEY-BASS PUBLICATIONS, 2002.
Lua MLA (9ú heag.)GRIFFIN JILL. CUSTOMER LOYALTY: HOW TO EARN IT, HOW TO KEEP IT. JOSSEY-BASS PUBLICATIONS, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.