Bodnar, George H.
Prentice Hall International, 1995
Buku Teks
Martin, Mearle
Prentice-Hall, 2003
Buku Teks
Gelinas, Ulric J.
South-Western , 2005
Buku Teks
Page, John R., 1949-
Prentice-Hall, 1987
Buku Teks
Romney, Marshall B.
Pearson Education, 2009
Buku Teks