Geiss, Imanuel
The Question of geoman unification
Routledge, 1997
 Buku Teks SO
Evans, Richard J.
Rereading German History From Unification to Reunification 1800 - 1996
Routledge, 1997
 Buku Teks
Billy
Konflik Identitas Tokoh Polisi Jerman Pasca Unifikasi dalam Film Freies Land (2019) = Identity Conflict of German Police Characters Post-Unification in Freies Land (2019)
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2024
 UI - Makalah dan Kertas Kerja
McKeane, Alasdair
German
Longman, 1994
 Buku Teks SO
Question and politeness
editor by Esther N. Goody
Cambridge University Press, 1978
 Buku Teks