Perry, Michael J.
Oxford University Press , 1990
Buku Teks
edited by P.M.S. Hacker and J. Raz
Clarendon Press, 1988
Buku Teks
Hart, H.L.A., author
Genta Publishing, 2009
Buku Teks
Skubik, Daniel W.
Peter Lang , 1990
Buku Teks
Weinreb, Lloyd L.
Harvard University Press, 1987
Buku Teks