Barnes, Jonathan
Pustaka utama Grafiti, 1993
Buku Teks
ANton, Peter John
Routledge and Kegan Paul, 1954
Buku Teks
Adler, Mortimer Jerome, 1902-2001
Macmillan, 1979
Buku Teks
Adler, Mortimer Jerome, 1902-2001
Macmillan, 1978
Buku Teks
Echenique, Javier
Cambridge University Press, 2012
Buku Teks