Wagener, Wolfgang, author
Phaidon, 2002
Buku Teks
Forcellino, Antonio, author
Polity Press, 2012
Buku Teks
Sealey, Raphael, author
London The University of North Carolina Press 1990,
Buku Teks
Sassower, Raphael
Routledge, 1995
Buku Teks
Kwakernaak, Huibert
Prentice-Hall, 1991
Buku Teks