Diehm, William J.
BPK Gunung Mulia, 1990
Buku Teks SO
Arens, William F.
Irwin /McGraw-Hill, 1999
Buku Teks SO
Proffit, William R
Mosby, 2000
Buku Referensi
Meredith, Carol
Rockport Publishers, 2000
Buku Referensi
Peterson, Susan
Laurence King Publishing, 2000
Buku Referensi