Lucas, R. W. (2009). Customer Service (4th.). McGraw Hill.
Chicago-čujuhus (17. p.)Lucas, Robert W. Customer Service. 4th. New York: McGraw Hill, 2009.
MLA-čujuhus (9. p.)Lucas, Robert W. Customer Service. 4th. McGraw Hill, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.