Guisnel, Jean (1999). Cyberwars : espionage on the Internet. Cambridge, MA: Perseus Books. p. 230. ISBN 0738202606. Mr. Robert D. Steele. Strategic Studies
Marlowe The Marlowe Society (页面存档备份,存于互联网档案馆) The works of Marlowe at Perseus Project (页面存档备份,存于互联网档案馆) Works by Christopher Marlowe in e-book BBC audio
Their Quest for a Peaceful World, Cambridge, Massachusetts: Westview, Perseus Books Group: 108, 2004, ISBN 0-8133-3275-3 Craig, Bruce. Setting the Record