APA (7th ed.) Citation

Walter, M. (1972). Gem cutting is easy. Crown Publishers.

Chicago Style (17th ed.) Citation

Walter, Martin. Gem Cutting Is Easy. New York: Crown Publishers, 1972.

MLA (8th ed.) Citation

Walter, Martin. Gem Cutting Is Easy. Crown Publishers, 1972.

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