Brown, Gordon W., author
Prentice-Hall, 1990
Buku Referensi
Gubby, Helen, author
Boon Juridische Uitgevers, 2007
Buku Teks
Dofka, Charline M., author
Delmar, Cengage Learning, 2007
Buku Teks
Wang
Buku Referensi
Dofka, Charline M., author
Delmar Cengage Learning, 2013
Buku Teks