Manley,Joan H. , author
Heinle & Heinle, 2005
Buku Teks
Kelly, Curtis, author
Cambridge university press, 2008
Buku Teks
Kelly, Curtis, author
Cambridge university press, 2010
Buku Teks
Weston, Marie-Therese
NTC Publishing Group, 1994
Buku Teks
Kurbegov, Eliane
Mc Graw Hill, 2012
Buku Teks