De Souto, Martha Sarbey. Group travel / Martha Sarbey de Souto. - 2nd ed. - Albany, N.Y. : Delmar Publishers, c1993. - viii, 439 p. ; 23 cm. ISBN: 0827335148 Subjects--Topical Terms: Travel agents--Handbooks, manuals, etc.Travel agents.Tourism--Employees Dewey Class. No.: 338.4791 / DES