Cita APA (7a ed.)

Gee, C. Y. (1990). Professional travel agency management. Prentice Hall.

Cita Chicago Style (17a ed.)

Gee, Chuck Y. Professional Travel Agency Management. Englewood Cliffs, N.J: Prentice Hall, 1990.

Cita MLA (9a ed.)

Gee, Chuck Y. Professional Travel Agency Management. Prentice Hall, 1990.