Davidoff, P. G., & Davidoff, D. S. (1994). Sales and marketing for travel and tourism (2nd ed.). Prentice Hall Career & Technology.
Lua i Stíl Chicago (17ú heag.)Davidoff, Philip G., agus Doris S. Davidoff. Sales and Marketing for Travel and Tourism. 2nd ed. Englewood Cliffs, N.J: Prentice Hall Career & Technology, 1994.
Lua MLA (9ú heag.)Davidoff, Philip G., agus Doris S. Davidoff. Sales and Marketing for Travel and Tourism. 2nd ed. Prentice Hall Career & Technology, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.