Prentice Hall International, 1991
Buku Teks
Madura, Jeff, author
Thomson South-Western, 2003
Buku Teks
Prentice Hall International, 1991
Buku Teks
Block, Stanley B., author
McGraw-Hill, 2002
Buku Teks
by Arthur J. Keown, John D. Martin, J. William Petty, and David F. Scott
Prentice-Hall, 2005
Buku Teks