James Joseph Sylvester (1877). “Address Delivered by J.J. Sylvester, F.R.S. (corresponding Member of the Institute of France), Professor of Mathematics, at Johns Hopkins University on Commemoration Day, February 22, 1877”
"The Birth of History and Philosophy of Science: Kepler's A Defence of Tycho Against Ursus With Essays on its Provenance and Significance". Book by N. Jardine, 1984.