APA (7th ed.) Citation

Schwahn-Prokopowicz, Baumgärtel, R., Prokopowicz, O., & Fetzer, R. (1955). Edelsteinkunde. Marhold.

Chicago Style (17th ed.) Citation

Schwahn-Prokopowicz, Rolf Baumgärtel, Otto Prokopowicz, and Renate Fetzer. Edelsteinkunde. Halle (Saale): Marhold, 1955.

MLA (8th ed.) Citation

Schwahn-Prokopowicz, et al. Edelsteinkunde. Marhold, 1955.