Cook, S. (2004). Customer care excellence.
Chicago-čujuhus (17. p.)Cook, Sara. Customer Care Excellence. New Delhi, 2004.
MLA-čujuhus (9. p.)Cook, Sara. Customer Care Excellence. 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.