Geiss, Imanuel
The question of German Unification 1806-1996
Routledge, 1997
 Buku Teks SO
Question and politeness
editor by Esther N. Goody
Cambridge University Press, 1978
 Buku Teks
Foley, Gerald
The energy question
Penguin Books, 1976
 Buku Teks SO
Srivastava, Mahavir Prasad, 1941-
The Korean conflict: search for unification
Prentice Hall of India Private , 1982
 Buku Teks SO
Foreign policy for peace and unification.
Asian Studies, 1974
 Buku Teks SO