Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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