APA (7th ed.) Citation

Chesterton, G. K., McCalman, E., & Collin, N. (1926). Menschenskind! Musarion Verlag.

Chicago Style (17th ed.) Citation

Chesterton, G. K., E. McCalman, and N. Collin. Menschenskind! Munich: Musarion Verlag, 1926.

MLA (8th ed.) Citation

Chesterton, G. K., et al. Menschenskind! Musarion Verlag, 1926.