501 must-take journeys
Emma Beare, editor
Bounty Books, 2013
 Buku Referensi
Trifoni, Jasmina
The world's 100 best adventure trips
White Star Publishers, 2013
 Buku Referensi
Zhang Chunxia
Volunteer campaigs in China
Baiwanzhuang Street, 2009
 Buku Teks
New horizons world guide
edited by Gerald W. Whitted
Pan American World Airways, 1971
 Buku Referensi
New horizons world guide : Pan American's Travel Facts about 108 countries
edited by Gerald W. Whitted
Pan American Airways, 1963
 Buku Teks SO