Bird, Richard M.
Ward Lock, 1995
Buku Teks
Brennan, Lynne
Platkus, 1991
Buku Teks
Flast, Robert
Berkely, California Osborne McGraw-Hill 1986,
Buku Teks
Becker, Norman
McGraw-Hill, 2011
Buku Teks
Budworth, Geoffrey
Chancellor Press , 1997
Buku Referensi