Gilpin, Robert, author
Princeton University Press, 1987
Buku Teks
edited by John Ravenhil
Oxford University Press, 2014
Buku Teks
Balaam, David N., 1950-, author
Pearson/Prentice Hall, 2005
Buku Teks
Balaam, David N., 1950-, author
Pearson Education, 2014
Buku Teks
Smith, Roy H., author
Routledge, 2017
Buku Teks