American Psychological Association
Knowles, David, & Obolensky, Dimitri ( 1972 ). Christian Centureis the Middle Ages ( 00 ed. ). Darton Longman & Todd Ltd.
Modern Language Association
Knowles, David and Obolensky, Dimitri. Christian Centureis the Middle Ages . Darton Longman & Todd Ltd. 1972
Chicago Citation
Knowles, David and Obolensky, Dimitri. Christian Centureis the Middle Ages . 00 .London
: Darton Longman & Todd Ltd, 1972.
American Medical Association
Knowles, David and Obolensky, Dimitri. Christian Centureis the Middle Ages . Darton Longman & Todd Ltd; 1972.