Georg Wilhelm Schimper - In Abyssinia. Observations on Tigre - Online Edition

Veröffentlichungen des Deutschen Historischen Instituts London = Publications of the German Historical Institute London (Vols. 50–55 and Vols. 57–70)

German Historical Institute London Bulletin

German Historical Institute London Bulletin - Supplement

British Envoys to the Kaiserreich, 1871-1897

British Envoys to Germany/Kaiserreich: Digital Index

Transnational Research Group India: Working Papers Series

1914-1918-online. International Encyclopedia of the First World War (joint research project)