Papell, David H., author
Houghton Mifflin, 2001
Buku Teks
Clark, James E., author
Houhton Mifflin, 2002
Buku Teks
DeLong, J. Bradford, author
McGraw-Hill, 2002
Buku Teks
Ricki Lewis ... [and others]
McGraw-HIll, 2002
Buku Teks
Casey, Francis, author
Macmillan, 1985
Buku Referensi