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TripAdvisor reminds everyone why travel agencies are screwed – Skift

The Only Guide for 85 Percent of U.STravel Agencies Won't Survive the Year

"Reservation Holdings And Expedia Are Both Growing Steadily, But In Extremely Various Ways". 26 August 2019. "Power List coverage". Travel Weekly. Khwaja, Ameen (1 February 2008). "How to Start a Travel Service". Wayment, Lucy (12 September 2002). "How to begin  Answers Shown Here . King, Christine (13 September 2005). Heinemann. ISBN 9780435459475.