APA (7th ed.) Citation

Deffke, W. H., Breuer, G., & Cole, I. F. (2014). Wilhelm Deffke: Pioneer of the modern logo. Scheidegger & Spiess.

Chicago Style (17th ed.) Citation

Deffke, Wilhelm H., Gerda Breuer, and Isabel Fargo Cole. Wilhelm Deffke: Pioneer of the Modern Logo. Zurich: Scheidegger & Spiess, 2014.

MLA (9th ed.) Citation

Deffke, Wilhelm H., et al. Wilhelm Deffke: Pioneer of the Modern Logo. Scheidegger & Spiess, 2014.