| APA | OMEN. (2012, February 15). In Acronym Geek. Retrieved 12:18, February 15, 2012, from http://www.acronymgeek.com/OMEN |
| MLA | "OMEN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OMEN>. |
| MHRA | 'OMEN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OMEN> [accessed 15 February 2012] |
| Chicago | "OMEN", http://www.acronymgeek.com/OMEN (accessed February 15, 2012). |
| CBE/CSE | OMEN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OMEN. |
| Bluebook | OMEN, http://www.acronymgeek.com/OMEN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OMEN, http://www.acronymgeek.com/OMEN (optional description here) (as of Feb. 15, 2012, 12:18). |
| AMA | OMEN. Acronym Geek. February 15, 2012, 12:18. Available at: http://www.acronymgeek.com/OMEN. Accessed February 15, 2012, 12:18. |