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