| APA | UNDO. (2012, February 16). In Acronym Geek. Retrieved 20:10, February 16, 2012, from http://www.acronymgeek.com/UNDO |
| MLA | "UNDO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/UNDO>. |
| MHRA | 'UNDO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/UNDO> [accessed 16 February 2012] |
| Chicago | "UNDO", http://www.acronymgeek.com/UNDO (accessed February 16, 2012). |
| CBE/CSE | UNDO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/UNDO. |
| Bluebook | UNDO, http://www.acronymgeek.com/UNDO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UNDO, http://www.acronymgeek.com/UNDO (optional description here) (as of Feb. 16, 2012, 20:10). |
| AMA | UNDO. Acronym Geek. February 16, 2012, 20:10. Available at: http://www.acronymgeek.com/UNDO. Accessed February 16, 2012, 20:10. |