- Frady, Marshall. Martin Luther King, Jr.: A Life. New York: Penguin Books, 2002.
- Rieder, Jonathan. Gospel of Freedom: Martin Luther King Jr.'s Letter from Birmingham Jail and the Struggle that Changed a Nation. New York: Bloomsbury Press, 2013.
- Blake, John. "How MLK became an angry black man." CNN.com. 10-01-2013. 16-04-2013. <http://www.cnn.com/2013/04/16/us/king-birmingham-jail-letter-anniversary>.
- Haberman, Frederick W., Ed. . "Martin Luther King Jr. - Biographical." Elsevier Publishing Company. 01-08-2013. <http://www.nobelprize.org/nobel_prizes/peace/laureates/1964/king-bio.html>.
- King, Martin Luther, Jr.. "Carta desde la cárcel de Birmingham." Universida de Granada. 01-07-2017. 20-04-2022. <https://wpd.ugr.es/~diegoch/?p=312>.
- Lacroix, Laurel Ph.D.. "Color Coded Rhetorical Analysis of Letter from Birmingham Jail." DeAnza College. 10-01-2013. <http://faculty.deanza.fhda.edu/schultzmary/stories/storyReader$884>.
- "Civil Disobedience - The History of the Concept." 11-01-2014. <http://science.jrank.org/pages/8660/Civil-Disobedience-History-Concept.html>.
- "King, Martin Luther, Jr. (1929-1968)." Stanford.edu. . 08-01-2014. <http://mlk-kpp01.stanford.edu/index.php/encyclopedia/encyclopedia/enc_martin_luther_king_jr_biography/>.