APA (7th ed.) Citation

Petzal, D. E. (1991). Encyclopedia of sporting firearms. Facts on File.

Chicago Style (17th ed.) Citation

Petzal, David E. Encyclopedia of Sporting Firearms. New York: Facts on File, 1991.

MLA (9th ed.) Citation

Petzal, David E. Encyclopedia of Sporting Firearms. Facts on File, 1991.