Knutsen, Torbjorn L.
a History of international relations theory : an introduction Knutsen
Manchester University Press, 1992
 Buku Teks
Tannsjo, Torbjorn
Understanding ethics: An Introduction to moral theory
Edinburgh University Press, 2010
 Buku Teks
Conway, Hazel
Understanding architecture : an introduction to architecture and architectural history
Routledge , 1994
 Buku Teks
Nye, Joseph S.
Understanding global conflict and cooperation: intro to theory and history
Essex Pearson, 2014
 Buku Teks
Nye, Joseph S.
Understanding global conflict and cooperation: intro to theory and history
Pearson, 2012
 Buku Teks