Cook, Chris, author
Macmillan, 1980
Buku Teks
Bailey, Sydney D., author
Institute of pacific relations, 1953
Buku Teks
Powell, Ken, author
Macmillan Press, 1977
Buku Teks
Stout, Hiram Miller, author
Oxford University Press, 1953
Buku Teks
Cook, Chris, author
Macmillan, 1975
Buku Referensi