APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.