Wirtz, J. Services Marketing: People, Technology, Strategy (9th.). World Scientific.
Chicago-čujuhus (17. p.)Wirtz, Jochen. Services Marketing: People, Technology, Strategy. 9th. World Scientific.
MLA-čujuhus (9. p.)Wirtz, Jochen. Services Marketing: People, Technology, Strategy. 9th. World Scientific.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.