Hans-Jürgen Ohff (2008) Empires of enterprise: German and English commercial interests in East New Guinea 1884 to 1914Thesis (PhD University of Adelaide, School of History and Politics) at p 10.
Hans-Jürgen Ohff (2008) Empires of enterprise: German and English commercial interests in East New Guinea 1884 to 1914Thesis (Ph.D.) University of Adelaide, School of History and Politics p 26 quoting Schleinitz to Admiralty, 28 December 1875, Drucksache zu den Verhandlungen des Bundesrath, 1879, vol. 1, Denkschrift, xxiv–xxvii, p. 3.