APA (7th ed.) Citation

Schweppenhäuser, H., Spencer, L., Jost, S., & Smith, G. (1991). Propaedeutics of profane illumination.

Chicago Style (17th ed.) Citation

Schweppenhäuser, Hermann, Lloyd Spencer, Stephan Jost, and Gary Smith. Propaedeutics of Profane Illumination. 1991.

MLA (9th ed.) Citation

Schweppenhäuser, Hermann, et al. Propaedeutics of Profane Illumination. 1991.