Frideres, James S.
Prentice Hall Canada, 1988
Buku Teks
University of Nebraska Press, 1967
Buku Teks
The Johns Hopkins Press, 1928
Buku Teks
Collier, John, 1884-1968, author
New American Library, 1947
Buku Teks
Canby, William C.
West Publishing Company, 1981
Buku Teks