APA (7th ed.) Citation

Tarbell, I. M., & Winkle, K. J. (1997). Abraham Lincoln and his ancestors. University of Nebraska.

Chicago Style (17th ed.) Citation

Tarbell, Ida M., and Kenneth J. Winkle. Abraham Lincoln and His Ancestors. Lincoln: University of Nebraska, 1997.

MLA (9th ed.) Citation

Tarbell, Ida M., and Kenneth J. Winkle. Abraham Lincoln and His Ancestors. University of Nebraska, 1997.