Barry Dufour ,Will Curtis
McGraw-Hill, 2011
Buku Teks
Giles, Judy, author
Blacwell Publisher, 2008
Buku Teks
Hayward, Susan, author
Routledge , 2006
Buku Referensi
Bernadette Casey.... (et all...)
Routledge , 2008
Buku Teks
Hayward, Susan, author
Routledge, 2006
Buku Teks