De Souto, M. S. (1985). Group travel operations manual. Delamr Pub.
芝加哥风格引文De Souto, Martha Sarbey. Group Travel Operations Manual. Albany, N.Y: Delamr Pub, 1985.
MLA引文De Souto, Martha Sarbey. Group Travel Operations Manual. Delamr Pub, 1985.
警告：这些引文格式不一定是100％准确.