Solomon, Irving I., author
New American Library , 1968
Buku Teks
O`Brien, James A., 1936-, author
Richard D. Irwin, 1975
Buku Teks
Yearsley, R.B., author
Gower Press, 1974
Buku Referensi
Bentley, Colin, author
Heyden and Sons, 1982
Buku Teks
Maynard, Jeff, author
Butterworths, 1972
Buku Teks