Reay, D.A.
Pergamon Press, 1979.
Buku Teks
Reay, D.A.
Pergamon Press, 1979
Buku Referensi
Headley Brothers Ltd, Kent, UK,
Majalah, Jurnal, Buletin
Rishel, James B.
Mcgraw-Hill, 2002
Buku Referensi
Church, Austin
Robert E. Krieger Publishing Company, 1972
Buku Teks