Gregory, Paul R., author
Hougton Mifflin, 1985
Buku Teks
edited by Morris Bornstein
Richard D. Irwins, 1969
Buku Teks
Halm, George N.
Feffer and Simons, 1971
Buku Teks
Richard D. Irwin, 1985
Buku Teks
Loucks, William N.
Harper and Row , 1973
Buku Teks
Loucks, William N.
Harper and Row , 1965
Buku Teks