APA (7th ed.) Citation

Webster, S., & Phillips, R. G. (1993). Group travel operating procedures (2nd ed.). Van Nostrand Reinhold.

Chicago Style (17th ed.) Citation

Webster, Susan, and Ralph G. Phillips. Group Travel Operating Procedures. 2nd ed. New York: Van Nostrand Reinhold, 1993.

MLA (9th ed.) Citation

Webster, Susan, and Ralph G. Phillips. Group Travel Operating Procedures. 2nd ed. Van Nostrand Reinhold, 1993.