Bodnar, George H., author
Prentice-Hall International, 1998
Buku Teks
Leitch, Robert A., author
Prentice-Hall, 1983
Buku Teks
Page, John R., 1949-, author
Prentice-Hall International, 1992
Buku Teks
Carr, Houston H., author
McGraw-Hill, 2003
Buku Teks
Evans, Nicholas D.
Prentice-Hall, 2002
Buku Teks