Balje, O.E.
John Wiley & Sons, 1981
Buku Teks
Balje, O. E., author
Wiley, 1981
Buku Referensi
Round, G.F. (George Frederick)
Elsevier, , 2004.
Buku Teks
Ashby, M. F. (Michael F.), author
Elsevier, 2005
Buku Teks
Lansdown, A.R., author
Pergamon Press, 1982
Buku Referensi