Abraham Lincoln (2013). “Leadership Lessons of Abraham Lincoln: Apply the Principles of the Sixteenth President to Your Own Work and Life”, p.13, Skyhorse Publishing, Inc.
"Beginnings: A New Perspective: Life Is Not about the Beginning Or the Ending. It is about the Present Moment" by Catherine Zeeb, Xlibris Corporation, (p. 94), May 12, 2010.
Abraham Lincoln, Stephen Arnold Douglas, Rodney O. Davis, Douglas Lawson Wilson (2008). “The Lincoln-Douglas Debates”, p.32, University of Illinois Press