Drake, Henry Burgess
Oxford University Press, 1951
Buku Teks SO
Lerner, Laurence D.
Oxford University Press, 1954
Buku Teks SO
Wilson, John B.
Longmans Green , 1958
Buku Teks SO
Eaglestone, Robert
Routledge, 2005
Buku Teks SO
French, F. G.
Oxford University Press, 1947
Buku Teks SO