(en-GB) Susan Horner et John Swarbrooke, Marketing Tourism, Hospitality and Leisure in Europe, Londres, International Thomson Business Press, , 702 p. (ISBN0-412-62170-3 et 9780412621703, OCLC436083917, lire en ligne), p. 97.
(en-GB) Susan Horner et John Swarbrooke, Marketing Tourism, Hospitality and Leisure in Europe, Londres, International Thomson Business Press, , 702 p. (ISBN0-412-62170-3 et 9780412621703, OCLC436083917, lire en ligne), p. 97.