Freedman, R. (2012). Abraham Lincoln and Frederick Douglass: The story behind an American friendship. Houghton Mifflin Harcourt/Clarion Books.
Cita Chicago Style (17a ed.)Freedman, Russell. Abraham Lincoln and Frederick Douglass: The Story Behind an American Friendship. Boston: Houghton Mifflin Harcourt/Clarion Books, 2012.
Cita MLA (8a ed.)Freedman, Russell. Abraham Lincoln and Frederick Douglass: The Story Behind an American Friendship. Houghton Mifflin Harcourt/Clarion Books, 2012.
Precaución: Estas citas no son 100% exactas.