Bodnar, George H.
Prentice Hall International, 1995
Buku Teks
Wilkinson, Joseph W.
John Wiley & Sons, 1991
Buku Teks
Bodnar, George H.
Prentice Hall International, 1998
Buku Teks
Prentice-Hall editorial staff, Jerome K. Pescow, editor
Prentice-Hall, 1992
Buku Referensi
Prentice-Hall editorial staff, Jerome K. Pescow, editor
Prentice-Hall, 1976
Buku Referensi