SABRE reservations and ticketingInstitute of Certified Travel Agents, Phillip G. Davidoff, Doris S. Davidoff, Donald M. Davidoff, Sharon Finn · First published 1995Open the Tome
Tourism geographyPhilip G. Davidoff, Doris S. Davidoff, J. Douglas Eyre · First published 1988Open the Tome
Sales & Marketing for Travel & TourismPhilip G. Davidoff, Doris S. Davidoff · First published 1983Open the Tome