Springer, 2012
eBooks
King, Kenneth, author
Longmann Group, 1991
Buku Teks
edited by Frances Stewart, Ruhi Saith, Barbara Harriss-White
Palgrave Macmillan, 2007
Buku Teks
Bryant, John, author
Cornell University Press, 1969
Buku Teks
Grosvenor Press, 1986
Buku Teks