Phillips, L Charles, author
Pearson Educational International, 2003
Buku Teks
Thomas, TG, author
McGra-Hill, 2006
Buku Teks
edited by Silvia Perotto, Frantisek Baluska
Springer-Verlag, 2012
eBooks
Harper & Row , 1981
Buku Teks
Kwakernaak, Huibert
Prentice-Hall, 1991
Buku Teks