German article in Die Gartenlaube, 1870, no. 1, 2

German series in Die Gartenlaube, 1886-

German article in Die Gartenlaube, 1886, no. 20

Neuchâtel, Wolfrath, 1845

German article in Die Gartenlaube, 1880, no. 21

Frankfurt am Main: Literarische Anstalt (J. Rütten), 1852.

German article in Die Gartenlaube, 1863, no. 14

German article in Die Gartenlaube, 1866, no. 3 und 21

German article in Die Gartenlaube, 1864, no. 40, 42, 46

German article in Die Gartenlaube, 1886, no. 45

German article in Die Gartenlaube, 1892, no. 2

German article in Die Gartenlaube, 1876, no. 16, 17

German article in Die Gartenlaube, 1862, no. 50 + 51

German article in Die Gartenlaube, 1863, no. 27

German article in Die Gartenlaube, 1865, no. 36, 39 und 45

German article in Die Gartenlaube, 1868, no. 13

German article in Die Gartenlaube, 1869, no. 10

German article in Die Gartenlaube, 1875, no. 32

German article in Die Gartenlaube, 1879, no. 2

German article series in Die Gartenlaube, 1876

German article in Die Gartenlaube, 1876, no. 48

German article in Die Gartenlaube, 1877, no. 50

German article in Die Gartenlaube, 1893, no. 49

German article in Die Gartenlaube, 1876, no. 25

German article in Die Gartenlaube, 1878, no. 16

London,Longman, Green, Longman, and Roberts;1864. | Natural History Museum Library, London

German article in Die Gartenlaube, 1887, no. 22

German article in Die Gartenlaube, 1865, no. 3

German article in Die Gartenlaube, 1887, no. 14

German article in Die Gartenlaube, 1864, no. 25

German article in Die Gartenlaube, 1875, no. 24

German article in Die Gartenlaube, 1875, no. 47

Frankfurt am Main: Literarische Anstalt, 1848.

Genève, Ziegler & Co., 1877.

German article in Die Gartenlaube, 1888, no. 8

German article in Die Gartenlaube, 1889, no. 46

London, Blackie[188-?]

London [etc.]: Blackie & son, ltd., [1887-1888]

London: Blackie & Son, [1889?]

German book, study by Karl Vogt, 1851

German article in Die Gartenlaube, 1861, no. 7

German series in Die Gartenlaube

German article in Die Gartenlaube, 1861, no. 12

German article in Die Gartenlaube, 1861, no. 24

German article in Die Gartenlaube, 1861, no. 7, 8

German article in Die Gartenlaube, 1862, no. 15

German article in Die Gartenlaube, 1861, no. 7–8

German article in Die Gartenlaube, 1861, no. 12; 15

German article in Die Gartenlaube, 1861, no. 24–25

German article in Die Gartenlaube, 1861, no. 36

German article in Die Gartenlaube, 1862, no. 37, 38

German article in Die Gartenlaube, 1862, no. 42, 43

German article in Die Gartenlaube, 1888, no. 18

German article in Die Gartenlaube, 1888, no. 40

German article in Die Gartenlaube, 1885, no. 5, 6

German article in Die Gartenlaube, 1863, no. 30

German article in Die Gartenlaube, 1879, no. 14