WHAT WERE THE CRUSADES? - RILEY-SMITH, JONATHAN (THE MACMILLAN PRESS, LTD. ENGLAND, 1992)
Keywords: HISTORY; CRUSADES; 1095-1500; CRUSADES TO THE NEAR EAST; CRUSADES IN SPAIN; CRUSADES IN NORTHEASTERN EUROPE; CRUSADES AGAINST SCHISMATICS AND HERETICS; CRUSADES AGAINST LAY POWERS IN THE WEST