Kelly, Curtis, author
Cambridge university press, 2008
Buku Teks
Kelly, Curtis, author
Cambridge university press, 2010
Buku Teks
Tabor, Aaron, author
Elsevier, 2009
Buku Teks
McCrimmon, James M., author
Houghton Miffiln, 1967
Buku Teks
Spaventa, Lou J., author
McGraw-Hill, 2001
Buku Teks