The Problem of West-Berlin and solutions proposed by the government of the German Democratic Republic : with relevant documents
The Ministry of Foreign Affairs of the German Democratic Republic, 1961
 Buku Teks
Purcell, Edward A.
The crisis of democratic theory; scientific naturalism & the problem of value
The University Press, 1973
 Buku Teks
Guruswamy, Laskshman
Supplement of basic documents to international law and world order: a problem-oriented coursebook
[Publisher not identified], 1994
 Buku Teks
Simbolon, Alvin Christopher
Oposisi intra aliansi antara Turki dan NATO: Studi kasus permasalahan Kurdi = The intra-alliance opposition between Turkey and NATO: A case study of the Kurdish problem.
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2021
 UI - Tesis Membership
Robertson, S. Ian
Problem solving
Psychology Press, 2001
 Buku Teks