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"The Measure of Genius: Michelangelo's Sistine Chapel at 500." Smithsonian. Accessed April 22, 2015. http://www.smithsonianmag.com/arts-culture/the-measure-of-genius-michelangelos-sistine-chapel-at-500-123313873/?no-ist.
Encyclopædia Britannica Online, s. v. "Michelangelo", accessed April 22, 2015,http://www.britannica.com/EBchecked/topic/379957/Michelangelo
"Michelangelo." History.com. Accessed April 22, 2015. http://www.history.com/topics/michelangelo.
"Michelangelo." :Paintings,Sculptures,Biography of. Accessed April 22, 2015. http://www.michelangelo.org/.
"The Measure of Genius: Michelangelo's Sistine Chapel at 500." Smithsonian. Accessed April 22, 2015. http://www.smithsonianmag.com/arts-culture/the-measure-of-genius-michelangelos-sistine-chapel-at-500-123313873/?no-ist.