Cita APA (7th ed.)

De Souto, M. S. (1985). Group travel operations manual. Delamr Pub.

Cita Chicago (17th ed.)

De Souto, Martha Sarbey. Group Travel Operations Manual. Albany, N.Y: Delamr Pub, 1985.

Cita MLA (9th ed.)

De Souto, Martha Sarbey. Group Travel Operations Manual. Delamr Pub, 1985.