APA (7th ed.) Citation

Nichols, R. L., & Halley, P. L. (1980). Stephen Long and American frontier exploration. University of Delaware Press.

Chicago Style (17th ed.) Citation

Nichols, Roger L., and Patrick L. Halley. Stephen Long and American Frontier Exploration. Newark: University of Delaware Press, 1980.

MLA (9th ed.) Citation

Nichols, Roger L., and Patrick L. Halley. Stephen Long and American Frontier Exploration. University of Delaware Press, 1980.