APA aipamena

Ashim Gupta. (2012). Travel agency and tour operations: Concepts and principles. Centrum Press.

Chicago Style aipamena

Ashim Gupta. Travel Agency and Tour Operations: Concepts and Principles. New Delhi: Centrum Press, 2012.

MLA aipamena

Ashim Gupta. Travel Agency and Tour Operations: Concepts and Principles. Centrum Press, 2012.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.