Hatt, John
Pan Books, 1982
Buku Teks
Planet, Lonely, author
Lonely Planet, 2012
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Heller, Steven, auhtor
Rockport publishers, 2011
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Perkins, Dennis N.T., 1953-, author
Amacom, 2012
Buku Teks
Perkins, Dennis, author
Amacom, 2012
Buku Teks