edited by John R. Burr
Greenwood Press, 1980
Buku Referensi
Stepanchev, Stephen, author
Harper and Row, 1965
Buku Teks
chosen by MacDonald P. Jackson and Vincent O'Sullivan
Oxford University Press, 1983
Buku Teks
Ward, John, author
Routledge , 1997
Buku Teks
Divine, Robert A., author
Alfred A. Knopf, 1985
Buku Teks