Tartaron, Thomas F, author
Cambridge University Press, 2013
Buku Teks
Prescott, J.R.V.
Methuen & Co., 1986
Buku Teks
Easley, David, author
Cambridge University Press, 2018
Buku Teks
Hansen, Derek L., author
Morgan Kaufmann, 2011
Buku Teks
Connor, F.R., author
Edward Arnold, 1972
Buku Teks