Harvard Business School. (2011). Increasing Customer Loyalty. Harvard Business.
Chicago-čujuhus (17. p.)Harvard Business School. Increasing Customer Loyalty. Boston: Harvard Business, 2011.
MLA-čujuhus (9. p.)Harvard Business School. Increasing Customer Loyalty. Harvard Business, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.