Benton, William K., author
Addison-Wesley, 1971
Buku Teks
Publications International, 2000
Buku Referensi
Balje, O.E.
John Wiley & Sons, 1981
Buku Teks
Lansdown, A.R., author
Pergamon Press, 1982
Buku Referensi
Balje, O. E., author
Wiley, 1981
Buku Referensi