APA (7th ed.) Citation

Gübelin, E., & Wolgensinger, M. (1969). Pierres précieuses. Silva.

Chicago Style (17th ed.) Citation

Gübelin, E., and Michael Wolgensinger. Pierres Précieuses. Zurich: Silva, 1969.

MLA (9th ed.) Citation

Gübelin, E., and Michael Wolgensinger. Pierres Précieuses. Silva, 1969.

Warning: These citations may not always be 100% accurate.