Παραπομπή σε μορφή APA (7η εκδ.)

Irwin, MacNeill, D., Schwartz, R., & Trooboff, S. (1995). Travel sales and customer service: The institute of certified travel agents. Irwin.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Irwin, Dedra MacNeill, Roberta Schwartz, και Stevan Trooboff. Travel Sales and Customer Service: The Institute of Certified Travel Agents. Boston: Irwin, 1995.

Παραπομπή σε μορφή MLA (8th εκδ.)

Irwin, et al. Travel Sales and Customer Service: The Institute of Certified Travel Agents. Irwin, 1995.