edited by Maurice E. O'Donnell
Houghton Mifflin, 1966
Buku Teks
edited by Nimrod Raphaeli
Allyn and Bacon, 1967
Buku Teks
Simon, Herbert A.
Alfred A. Knopf, 1973
Buku Teks
Bartholomew, Paul C.
Littlefield, Adams, 1959
Buku Teks
edited by Robert T. Golembiewski, Frank Gibson, Geoffrey Y. Cornog
Rand McNally College, 1972
Buku Teks