APA (7th ed.) Citation

Webster, R. (1970). Gems: Their sources, descriptions, and identifications ([2d ed.). Archon Books.

Chicago Style (17th ed.) Citation

Webster, Robert. Gems: Their Sources, Descriptions, and Identifications. [2d ed. Hamden, Conn.]: Archon Books, 1970.

MLA (9th ed.) Citation

Webster, Robert. Gems: Their Sources, Descriptions, and Identifications. [2d ed. Archon Books, 1970.