Negi, J. (1997). Travel agency and tour operation: Concepts and principles. Kanishka pub.
Chicago-čujuhus (17. p.)Negi, J. Travel Agency and Tour Operation: Concepts and Principles. Delhi: Kanishka pub, 1997.
MLA-čujuhus (9. p.)Negi, J. Travel Agency and Tour Operation: Concepts and Principles. Kanishka pub, 1997.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.