Negi, J. (2008). Travel agency operations: Concepts and principles. Kaniksha.
Chicago Style aipamenaNegi, Jagmohan. Travel Agency Operations: Concepts and Principles. New Delhi: Kaniksha, 2008.
MLA aipamenaNegi, Jagmohan. Travel Agency Operations: Concepts and Principles. Kaniksha, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.