APA (7th ed.) Citation

Broel, G., Ehrenberg, P. R. R., & Ehrenberg, C. (1913). Paul u. Clara Ehrenberg.

Chicago Style (17th ed.) Citation

Broel, Georg, Paul Richard Rudolf Ehrenberg, and Clara Ehrenberg. Paul U. Clara Ehrenberg. [S.l.], 1913.

MLA (9th ed.) Citation

Broel, Georg, et al. Paul U. Clara Ehrenberg. 1913.