Clark, Lyn R.
McGraw-Hill, 2000
Buku Teks
Dignen, Bob, author
York Associates, 1999
Buku Teks
Guffey, Mary Ellen, author
PWS Publishing, 1991
Buku Teks
Guffey, Mary Ellen, author
PWS-Kent, 1988
Buku Teks
Guffey, Mary Ellen, author
Cengage Learning Asia, 2008
Buku Teks