Davis, W. Jackson
W.W. Norton & Company, 1979
Buku Teks
University of Tokyo Press, 1970
Buku Teks
Aditya Media, 1994
Buku Teks
Ralph, Philip Lee, author
E. P. Dutton & Co., 1954
Buku Teks
Ewing, Ethel E., author
Rand McNally & Company, 1962
Buku Teks