ebrary, Inc, Williams, F. J., & Pederson, W. D. (2009). Lincoln lessons: Reflections on America's greatest leader. Southern Illinois University Press.
Chicago-viite (17. p.)ebrary, Inc, Frank J. Williams, ja William D. Pederson. Lincoln Lessons: Reflections on America's Greatest Leader. Carbondale: Southern Illinois University Press, 2009.
MLA-viite (9. p.)ebrary, Inc, et al. Lincoln Lessons: Reflections on America's Greatest Leader. Southern Illinois University Press, 2009.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.