Welsch, Glenn A., author
Prentice-Hall, 1970
Buku Teks
Lewis, Ralph F., author
Heinemann, 1974
Buku Teks
Mandelker, Daniel R., author
Michie Company, 1985
Buku Teks
Gardner, Fred V., author
McGraw-Hill, 1955
Buku Teks
Holden, Ian
Hutchinson , 1973
Buku Teks