Keeble, Richard, author
Routledge , 2009
Buku Teks
Faubion, James D., author
Cambridge University Press, 2011
Buku Teks
Floridi, Luciano, 1964-, author
Oxford University Press, 2015
Buku Teks
Keeble, Richard, author
Routledge, 2001
Buku Teks
Ottensmeyer, Edward J., author
McGraw-Hill, 1996
Buku Teks