DUTKA, A. (1994). Ama Handbook For Customer Satisfaction Alan Dutka. NTC Business Books.
Lua i Stíl Chicago (17ú heag.)DUTKA, Alan. Ama Handbook For Customer Satisfaction Alan Dutka. NTC Business Books, 1994.
Lua MLA (8ú heag.)DUTKA, Alan. Ama Handbook For Customer Satisfaction Alan Dutka. NTC Business Books, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.