Acheson, Patricia C.
Dood, Mead & Company, 1962
Buku Teks
The University of Chicago Press, 1964
Buku Teks
The H. W. Wilson Company, 1961
Buku Teks
Johnson, Gerald W.
William Morrow and Company, 1962
Buku Teks
Bickel, Alexander M.
Harper Torchbooks, 1970
Buku Teks