Wallerstein, Immanuel, author
Cambridge University Press, 1991
Buku Teks
Dodds, Klaus
Prentice-Hall, 2000
Buku Teks
Flint, Colin, author
Routledge, Taylor & Francis Group, 2017
Buku Teks
O`Tuathail, Gearoid
Routledge, 1996
Buku Teks
edited by Geatoid O`Tuathail and Simon Dalby
Routledge, 1998
Buku Teks