Ackerman, James S. The architecture of Michelangelo / by James S. Ackerman ; with a catalogue of Michelangelo's works, by James A. Ackerman and John Newman. - Harmondsworth : Penguin, 1970. - 373 p. : ill. ; 20 cm. ISBN: 0140211845 Subjects--Personal Names: Michelangelo Buonarroti, 1475--1564