Loucks, William N.
Harper and Row , 1973
Buku Teks
Halm, George N.
Feffer and Simons, 1971
Buku Teks
Blodgett, Ralp H., author
Macmillan, 1949
Buku Teks
Gregory, Paul R., author
Hougton Mifflin, 1985
Buku Teks
edited by Morris Bornstein
Richard D. Irwins, 1969
Buku Teks
Carson, Richard L.
Macmillan, 1973
Buku Teks