Foster, Douglas
Travel and tourism management / Douglas Foster
Macmillan, 1985
 Buku Teks
Industrial wastewater management handbook
editor-in-chief, Hardam Singh Azad
McGraw-Hill, 1976
 Buku Referensi
Elliot, James
Tourism
Routledge, 1997
 Buku Teks
Tourism
Longman, 1999
 Buku Teks
Cases in Singapore hospitality and tourism management
edited by Hooi Den Huan
Prentice-Hall, 1999
 Buku Teks
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