APA (7th ed.) Zitazioa

Boegel, H. (1971). A collector's guide to minerals and gemstones. Thames and Hudson.

Chicago Style (17th ed.) Zitazioa

Boegel, Hellmuth. A Collector's Guide to Minerals and Gemstones. London, England, United Kingdom: Thames and Hudson, 1971.

MLA (9th ed.) Zitazioa

Boegel, Hellmuth. A Collector's Guide to Minerals and Gemstones. Thames and Hudson, 1971.