Garrison, Paul
TAB Books, 1982
Buku Teks
Longkutoy, John J.
Mutiara, 1980
Buku Teks
Longkutoy, John J.
Mutiara Sumber Widya, 1985
Buku Teks
edited by Michael R. Kibby and J. Roger Hartley
Pergamon Press, 1992
Buku Teks
Earnshaw, J.D.
Pitman, 1970
Buku Teks