Voigt-Diederichs, H., & Herbig, O. (1940). Welt des Kindes: Bilder des Malers Otto Herbig / Einf. von Helene Voigt-Diederichs. Eugen Diederichs Verl..
Citazione stile Chigago Style (17a edizione)Voigt-Diederichs, Helene, e Otto Herbig. Welt Des Kindes: Bilder Des Malers Otto Herbig / Einf. Von Helene Voigt-Diederichs. Jena: Eugen Diederichs Verl., 1940.
Citatione MLA (8a ed.)Voigt-Diederichs, Helene, e Otto Herbig. Welt Des Kindes: Bilder Des Malers Otto Herbig / Einf. Von Helene Voigt-Diederichs. Eugen Diederichs Verl., 1940.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.