Epistemology - Second Edition. 2009年7月30日: pp. 107-132 ISBN 9781551119076 Pritchard, Duncan. London Routledge. What is this thing called knowledge - 3rd Edition
September 2020]. (原始内容存档于2021-01-11). (页面存档备份,存于互联网档案馆) Winston Lo; Derek Pritchard. Hong Kong Outward Bound School 1990-1991. Hong Kong: The Outward Bound