Church, James C., author
McGraw-Hill, 1979
Buku Referensi
Peters, Pamela, author
Wm.C. Brown Pub., 1993
Buku Referensi
Brady, George S., author
McGraw-Hill, 1997
Buku Referensi
Brady, George S.
McGraw-Hill, 1986
Buku Referensi
Balje, O.E.
John Wiley & Sons, 1981
Buku Teks