Mesquita, Bruce Bueno de, author
MIT Press, 2003
Buku Teks
Singh, D.S. Ranjit
Oxford University Press, 1984
Buku Teks
Wriggins, W. Howard
Columbia University Press, 1969
Buku Teks
Lussier, Danielle N., author
Cambridge University Press, 2016
Buku Teks
Huckfeldt, Robert, author
Cambridge University Press, 2004
Buku Teks