Tregold, R.F., author
International University Press, 1950
Buku Teks
Gardner, Burleigh B., author
Irwin , 1955
Buku Teks
Prentice-Hall, 1949
Buku Teks
Martin, Robert J., author
Van Nostrand Reinhold, 1991
Buku Teks
Fulmer, Robert M., author
Richard D. Irwin , 1983
Buku Teks