Bella Chip R. & Zebke Ron. (2007). Managing Knock Your Socks off Service. American Management Association.
Chicago-čujuhus (17. p.)Bella Chip R. juo Zebke Ron. Managing Knock Your Socks off Service. NewYork: American Management Association, 2007.
MLA-čujuhus (9. p.)Bella Chip R. juo Zebke Ron. Managing Knock Your Socks off Service. American Management Association, 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.