APA Edition Citation

Kraus, E. H. a. S. (1941). Gems and Gem minerals. McGraw Hill.

Chicago Edition Citation

Kraus, Edward Henry and Slawson. Gems and Gem Minerals. New York: McGraw Hill, 1941.

MLA Edition Citation

Kraus, Edward Henry and Slawson. Gems and Gem Minerals. McGraw Hill, 1941.

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