Preussens Diplomatie in der Türkei : 1721 - 1774 - Scheel, Helmuth (deGruyter, 1931)
Includes facsims. of correspondence from Ahmed III to Friedrich Wilhelm I, Mustafā III to Friedrich II, ʻAbd ul-Hamīd Chān to Friedrich II. 1928.
Originally presented as the author's thesis, Greifswald,