Anderson, Chester G.
Thames & Hudson, 1967
Buku Teks SO
Marcus, Phillip L.
Macmillan, 1992
Buku Teks SO
Fraser, George Sutherland, 1915-
Published for the British Council and the National Book League by Longmans, 1965
Buku Teks SO
Marjorie Howes, John Kelly, editor
Cambridge University Press, 2008
Buku Teks SO
Macmillan, 1984
Buku Teks SO