DENTON D KEITH. (1991). HORIZONTAL MANAGEMENT: BEYOND TOTAL CUSTOMER SATISFACTION. LEXINGTON BOOKS.
Lua i Stíl Chicago (17ú heag.)DENTON D KEITH. HORIZONTAL MANAGEMENT: BEYOND TOTAL CUSTOMER SATISFACTION. NEW YORKS: LEXINGTON BOOKS, 1991.
Lua MLA (9ú heag.)DENTON D KEITH. HORIZONTAL MANAGEMENT: BEYOND TOTAL CUSTOMER SATISFACTION. LEXINGTON BOOKS, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.