| 1. | International business travel 1988 / by Robert Cleverdon & Kevin O'BrienAutor: Cleverdon, Robert Data Publicação: 1988 Coautor: O Brien, Kevin Co col. autor sec.: EIU |  | |
| 2. | International business travel : a new megamarket / by Robert CleverdonAutor: Cleverdon, Robert Data Publicação: 1985 Co col. autor sec.: EIU | | |
| 3. | Sri Lanka / Robert CleverdonAutor: Cleverdon, Robert |  | |
| 4. | Bermuda / Robert CleverdonAutor: Cleverdon, Robert | | |
| 5. | Trends and forecasts worldwide and by region / Robert CleverdonAutor: Cleverdon, Robert | | |