APA (7th ed.) Citation

Ryan, A. H. (1979). The week-end rock hound (2nd ed., rev.). Gem Guides Book Co..

Chicago Style (17th ed.) Citation

Ryan, A. H. The Week-end Rock Hound. 2nd ed., rev. Pico Rivera, Calif.: Gem Guides Book Co., 1979.

MLA (9th ed.) Citation

Ryan, A. H. The Week-end Rock Hound. 2nd ed., rev. Gem Guides Book Co., 1979.