Fraser, D.A.S., author
John Wiley & Sons, 1967
Buku Teks SO
Johnson, Palmer O., author
Prentice-Hall, 1953
Buku Teks
Montgomery, Douglas C., author
Gadjah Mada University Press, 1990
Buku Teks
Connor, L.R.
Sir Isaac Pitman & Sons, 19--
Buku Teks
Huntsberger, David V., author
Allyn and Bacon, 1970
Buku Teks