the Lion's Mouth: Hope and Heartbreak in Humanitarian Assistance 2nd. XLibris LLC. 2013: 9 [2020-04-25]. ISBN 978-1-4836-9519-8. OCLC 922837922. (原始内容存档于2020-09-28)
Duncan, Lloyd. Just Getting There: An Autobiography. Bloomington: Xlibris Corporation. 2006: 78. ISBN 1-4257-1518-4. Branford College Website (页面存档备份,存于互联网档案馆)