018 . Professor Humphrey's home page (页面存档备份,存于互联网档案馆) 尼古拉斯·汉弗莱在互联网电影资料库(IMDb)上的資料(英文) The human factor (页面存档备份,存于互联网档案馆) by Andrew Brown. 29 July 2006
Publishers 1997 John Williams Humphrey, John Peter Oleson & Andrew N. Sherwood. Contributors: John Peter Oleson and Andrew N. Sherwood: Greek and Roman