Butterfield, Herbert
The Free Press , 1957
Buku Teks
Hutten, Ernest H.
Greenwood Press, 1978
Buku Teks
Keller, Evelyn Fox, author
Yale University Press , 1985
Buku Teks
Drake, Stillman
University of Toronto Press, 1999
Buku Teks
Shaharir Mohamad Zain, author
Universiti Kebangsaan Malaysia, 2000
Buku Teks