Tannsjo, Torbjorn, author
Edinburgh University Press, 2010
Buku Teks
Sevenhuijsen, Selma
Routledge , 1998
Buku Teks
Held, Virginia, author
Erlangga, 1991
Buku Teks
Beauchamp, Tom L., author
Oxford University Press, 2013
Buku Teks
White, Thomas I., author
NJ John Wiley & Sons,, 2017
Buku Teks