Tooley's dictionary of mapmakers, 1979---p. 334 [Vogel, Carl (1828-1897), Publisher and topographer who worked for the Geographische Anstalt (Geographical Institution) run by Justus Perthes in Gotha; from 1860 he specialised in depicting terrain on maps]

Österreichisch-Ungarische Monarchie, [1890]---(Bearbeitet von C. Volgel)