edited by Sybil P. Parker
New York, McGraw-Hill
Buku Referensi
Watson, Hugh J.
Businesss Publications , 1980
Buku Teks
Sanders, Donald H.
McGraw-Hill, 1979
Buku Teks
O`Brien, James A., 1936-
Richard D. Irwin, 1975
Buku Teks
Rosenberg, Jerry M.
John Wiley & Sons, 1987
Buku Referensi