Malin, Martin H.
Thomson/West, 2011
Buku Teks SO
Blanpain, Roger (et.al.)
Cambridge University Press, 2007
Buku Teks
Fraser, John Munro
MacDonald and Evans, 1966
Buku Teks SO
Morgan, Theodore
Prentice-Hall, 1956
Buku Teks
Morgan, Theodore
Prentice-Hall, 1948
Buku Teks