Wilkinson, Joseph W.
Erlangga , 1990
Buku Teks
Wilkinson, Joseph W.
John Wiley & Sons, 1991
Buku Teks
Gelinas, Ulric J.
South-Western , 2005
Buku Teks
Carrithers, Wallace M.
Charles E. Merrill, 1967
Buku Teks
Bodnar, George H.
Prentice-Hall International, 1998
Buku Teks