Bella Chip R. & Zebke Ron. (2007). Managing Knock Your Socks off Service. American Management Association.
Citazione stile Chigago Style (17a edizione)Bella Chip R. e Zebke Ron. Managing Knock Your Socks off Service. NewYork: American Management Association, 2007.
Citatione MLA (9a ed.)Bella Chip R. e Zebke Ron. Managing Knock Your Socks off Service. American Management Association, 2007.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.