12
Buhalis, Dimitrios.
| Financial Times Prentice Hall |
2003
14
Marcela Miozzo,Paul Dewick
| Edward Elgar |
2004
15
Geoffrey i. Crouch,Richard R. Perdue,Harry J.P. T
| CABI Publishing |
2004
16
Charles R. Goeldner,J.R. Brent Ritchie
| John Wiley & Sons |
2006
17
Charles R. Goeldner,J.R. Brent Ritchie
| John Wiley & Sons |
2006