Crompton, Samuel Willard, author
Karisma, 2007
Buku Referensi
Goodman, David G., author
Lexington Book, 2000
Buku Teks
Varley, H. Paul
Praegar Publisher , 1973
Buku Teks
Sakamoto, Taro, author
Gadjah Mada University Press, 1982
Buku Teks
Sadler, A. L.
Charles E. Tuttle, 1962
Buku Teks