Stewart, Hugh B.
Dow Jones-Irwin, 1989
Buku Teks
Rosenberg, Nathan, author
Cambridge University Press, 1976
Buku Teks
by Paul Trott ... [and others]
Routledge, 2016
Buku Teks
Carayannis, Elias G., author
[Springer, ], 2012
eBooks
Rothwell, Roy.
Longman, 1985.
Buku Teks