Gilpin, Robert, author
Princeton University Press, 1987
Buku Teks
edited by Thomas Clarke and Christos Pitelis
Routledge, 1993
Buku Teks
Sayer, R. Andrew, author
Blackwell, 1995
Buku Teks
Marx, Karl, 1818-1883, author
Foreign Languages , 1959
Buku Klasik
Balaam, David N., 1950-, author
Pearson Education, 2014
Buku Teks