Nobbs, Jack, author
McGraw-Hill, 1983
Buku Teks
Martin, Stephen, 1961-, author
Blacwell Publisher, 2002
Buku Teks
Solomon, R.C., author
DP Publications, 1992
Buku Teks
Norbert Pachler edited by
Routledge, , 1999
Buku Teks
Harris, Raymond, author
Jamestown, 1990
Buku Teks