Vatikiotis, Michael R.J.
Roultledge, 1994
Buku Teks
Vatikiotis, Michael R.J.
Routledge, 1997
Buku Teks
Heeger, Gerald A.
Macmillan, 1974
Buku Teks
edited by John D. Montgomery, William J. Siffin
McGraw-Hill, 1966
Buku Teks
Mortimer, Rex
Equinox, 2006
Buku Teks