APA (7th ed.) Citation

Keillor, G. (2005). Good poems for hard times. Penguin books.

Chicago Style (17th ed.) Citation

Keillor, Garrison. Good Poems for Hard Times. New York: Penguin books, 2005.

MLA (9th ed.) Citation

Keillor, Garrison. Good Poems for Hard Times. Penguin books, 2005.