Neate, Jill (1994). Mountaineering in the Andes: a sourcebook for climbers Paperback. Geographical Society. p. 2. ISBN0907649645. Consultado el 13 de agosto de 2015. «On 16 January 1911, accompanied by L. Hedderich, he made the first ascent of Pico Humboldt. During the same expedition Jahn and some Venezuelan surveyors made first ascents of Micanon, Tucani and Pico de los Conejos in the Sierra del Norte. A further attempt on Pico Bolίvar in 1915 failed on account of sickness in the party. Dr. Jahn’s writings include geography, geology and glaciology.»
