Transkaspien und seine Eisenbahn. Nach Acten des Erbauers Generallieutenant M Annenkow bearbeitet von Dr O Heyfelder Hannover: Helwingsche Verlagsbuchhandlung, 1888
Report of a mission to Chinese Turkistan and Badakhshan in 1885-86. By N Elias, Political Agent on Special Duty Calcutta: [Govt of India Foreign Dept], 1886
Notes on the road from Kashgar to Aris (Tashkent Railway) via the Turgat Pass, Narin, Tokmak, Pishpek and Chimkent. By G Macartney, His Britannic Majesty's Consul, Kashgar, June and July 1908 Simla: Intelligence Branch, Division of Chief of Staff, 1909