APA (7th ed.) Citation

Horn, C., Schönecker, D., & Mieth, C. (2006). Groundwork for the metaphysics of morals. De Gruyter.

Chicago Style (17th ed.) Citation

Horn, Christoph, Dieter Schönecker, and Corinna Mieth. Groundwork for the Metaphysics of Morals. Berlin ; New York: De Gruyter, 2006.

MLA (9th ed.) Citation

Horn, Christoph, et al. Groundwork for the Metaphysics of Morals. De Gruyter, 2006.