Salisbury, Harrison E., author
Harper & Row, 1967
Buku Teks
Ang, Cheng Guan, author
Routledge Curzon, 2004
Buku Teks
Hoang, Van Chi, author
Popular Library , 1964
Buku Teks
edited by P.J. Honey
Praeger, 1962
Buku Teks
Zagoria, Donald S., author
Pegasus , 1967
Buku Teks