APA (7th ed.) Citation

O'Hara, M. (1947). Green grass of wyoming. Magnet Book.

Chicago Style (17th ed.) Citation

O'Hara, Mary. Green Grass of Wyoming. London: Magnet Book, 1947.

MLA (9th ed.) Citation

O'Hara, Mary. Green Grass of Wyoming. Magnet Book, 1947.