Tourism, Post & Telecomunication , 1993
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Orbasli, Aylin, author
Taylor & Francis Group, 2000
Buku Teks
Dickinson, Robert E.
Routledge & Kegan Paul Limited, 1951
Buku Teks
Law, Christopher M., author
Continuum, 2002
Buku Teks
Page, Stephen J.
Royutledge, 1995
Buku Teks