*U.S. Army training manual [https://web.archive.org/web/20160313013651/http://fas.org/man/dod-101/army/docs/st100-7/chapter05/C5I.htm diagram] of different modes of attack, including double envelopment
*GlobalSecurity.org [http://www.globalsecurity.org/military/library/policy/army/fm/71-100/c4.htm#FM essay] with a section on envelopments
*Academic [http://www.cse.ohio-state.edu/~chandra/DR-paper-ASC.pdf paper] on military diagramming with diagram of a double envelopment
*[http://www.globalsecurity.org/military/library/report/2002/Web_Stalingrad3.jpg Map] of Georgy Zhukov's double envelopment at the battle of Stalingrad
