Ordeshook, Peter C., author
Routledge, 1992
Buku Teks
Islam, Syed Serajul, author
Thomson, 2005
Buku Teks
Key, V. O. (Valdimer Orlando), 1908-1963, author
Thomas Y. Crowell, 1954
Buku Teks
Scherer, Stefan, author
Springer-Verlag, 2012
eBooks
Smith, Kevin, author
Westview Press, Boston, Massachusetts : Credo Reference, 2013
Buku Teks