Cita APA

Boegel, H., & John, S. Collector's guide to minerals and gemstones.

Chicago Edition Citation

Boegel, Hellmuth, i Sinkankas John. Collector's Guide to Minerals and Gemstones.

Cita MLA

Boegel, Hellmuth, i Sinkankas John. Collector's Guide to Minerals and Gemstones.

Atenció: Aquestes cites poden no estar 100% correctes.