Hope, Michael, author
Oxford University Press, 2016
eBooks
Hearnshaw, F.J.C., author
G.G. Harrap, 1940
Buku Teks
Graham, Robert
St. Martin's Press, 1979
Buku Teks
Mayer, Ann Elizabeth, author
Westview Press, 1995
Buku Teks
Coll, Steve, 1958-, author
Penguin Books, 2012
Buku Teks