APA (7th ed.) Citation

Little, E. L. (1978). Important forest trees of the United States. U.S. Gov. Print. Off.

Chicago Style (17th ed.) Citation

Little, Elbert L. Important Forest Trees of the United States. Washington: U.S. Gov. Print. Off, 1978.

MLA (9th ed.) Citation

Little, Elbert L. Important Forest Trees of the United States. U.S. Gov. Print. Off, 1978.