Appleton-Century-Crofts, 1968
Buku Teks
Angresano, James, author
Prentice-Hall, 1991
Buku Teks
Loucks, William N., author
Harper and Row, 1965
Buku Teks
Halm, George N., author
Feffer and Simons, 1971
Buku Teks
Blodgett, Ralp H., author
Macmillan, 1949
Buku Teks