Deanna B. Marcum, editor
Greenwood Press, 2001
Buku Teks
Pierce, Eleanor B.
Pan American Airways, 1965
Buku Teks
Martin, David
Rigby, 1982
Buku Teks
Montes, Manuel F.
Institute of Southeast Asian Studies, 1999
Buku Teks
Losonsky, Michael
Cambridge University Press, 2006
Buku Teks