Hutten, Ernest H.
Greenwood Press, 1978
Buku Teks
Butterfield, Herbert
The Free Press , 1957
Buku Teks
Shaharir Mohamad Zain, author
Universiti Kebangsaan Malaysia, 2000
Buku Teks
Gillispie, Charles Coulston, author
Princeton University Press, 1960
Buku Teks
Kuhn, Thomas S., author
Remaja Rosdakarya, 1993
Buku Teks