Wanlass, John W., author
McGraw-Hill, 1993
Buku Teks
DiAntonio, Angelo E.
Prentice-Hall, 1986
Buku Teks
Kemp, Patrick S.
Dow Jones-Irwin, Inc., 1970
Buku Teks
Marriott, N.
Prentice-Hall, 1990
Buku Teks
DiAntonio, Angelo E.
Prentice-Hall, 1986
Buku Teks