Waldo, Dwight, author
Aksara Baru, 1971-1979
Buku Teks
Waldo, Dwight, author
Aksara Baru, 1984
Buku Teks
Pfiffner, John M., author
Ronald Press, 1960
Buku Teks
edited by Robert T. Golembiewski, Frank Gibson, Geoffrey Y. Cornog
Rand McNally College, 1972
Buku Teks
Simon, Herbert A., author
Alfred A. Knopf, 1973
Buku Teks