Halm, George N., author
Feffer and Simons, 1971
Buku Teks
Blodgett, Ralp H., author
Macmillan, 1949
Buku Teks
Gregory, Paul R., author
Hougton Mifflin, 1985
Buku Teks
Loucks, William N., author
Harper and Row, 1965
Buku Teks
Richard D. Irwin, 1985
Buku Teks