Hunter, Lynette
Routledge, 1999
Buku Teks
Baruss, Imants, author
Purdue Univ.Press , 1996
Buku Teks
Barrow, John D., author
Oxford University Press , 1998
Buku Teks
Azzouni, Jody, author
Routledge, 2000
Buku Teks
Martinez, Susan B., author
Bear Company , 2015
Buku Teks