See E. M. Peters, Torture (1985) and Inquisition (1988). For the Spanish Inquisition, see studies by A. S. Tuberville (1932, repr. 1968), C. Roth (1938, repr. 1964), R. E. Greenleaf (1969), P. J. Hauber (1969), H. A. F. Kamen (1965 and 1998), and E. Peters (1989).