APA (7th ed.) Citation

(1907). From left to right: Hilferding, Karl K., Minna K., Luise K., Anton Pannekoek and son, Georg Ledebour, Hans Block, Mathilde Wurm. Sitting: Minna Ledebou with son Block, Gertrud Block, Anna Pannekoek and daughter Block. Lying: Boys Block and Benedikt K.

Chicago Style (17th ed.) Citation

From Left to Right: Hilferding, Karl K., Minna K., Luise K., Anton Pannekoek and Son, Georg Ledebour, Hans Block, Mathilde Wurm. Sitting: Minna Ledebou with Son Block, Gertrud Block, Anna Pannekoek and Daughter Block. Lying: Boys Block and Benedikt K. 1907.

MLA (8th ed.) Citation

From Left to Right: Hilferding, Karl K., Minna K., Luise K., Anton Pannekoek and Son, Georg Ledebour, Hans Block, Mathilde Wurm. Sitting: Minna Ledebou with Son Block, Gertrud Block, Anna Pannekoek and Daughter Block. Lying: Boys Block and Benedikt K. 1907.