German article in Die Gartenlaube, 1871, no. 6

German article in Die Gartenlaube, 1896, no. 43

picture by Hermann Knackfuß

German article in Die Gartenlaube, 1871, no. 16

publication by Hermann Knackfuß, volume 13 of the book series "Künstler-Monographien"

1st edition (1896) of the monograph by Hermann Knackfuß

6th edition (1923) of the monograph by Hermann Knackfuß

publication by Hermann Knackfuß, volume 5 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 12 of the book series "Künstler-Monographien", 1896

publication by Hermann Knackfuß, volume 17 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 7 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 4 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 10 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 1 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 3 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 2 of the book series "Künstler-Monographien"

publication by Hermann Knackfuß, volume 29 of the book series "Künstler-Monographien"

monograph by Hermann Knackfuß, volume 6 of the book series "Künstler-Monographien"