German article in Die Gartenlaube, 1868, no. 47

German article in Die Gartenlaube, 1864, no. 41

German article in Die Gartenlaube, 1868, no. 23,24

German article in Die Gartenlaube, 1868, no. 10

German article in Die Gartenlaube, 1872, no. 6 und 7

entry in the Allgemeine Deutsche Biographie

German article in Die Gartenlaube, 1880, no. 41

1879 novel by Ludwig Steub

German article in Die Gartenlaube, 1865, no. 5