| APA | OMPO. (2012, February 16). In Acronym Geek. Retrieved 16:27, February 16, 2012, from http://www.acronymgeek.com/OMPO |
| MLA | "OMPO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OMPO>. |
| MHRA | 'OMPO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OMPO> [accessed 16 February 2012] |
| Chicago | "OMPO", http://www.acronymgeek.com/OMPO (accessed February 16, 2012). |
| CBE/CSE | OMPO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OMPO. |
| Bluebook | OMPO, http://www.acronymgeek.com/OMPO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OMPO, http://www.acronymgeek.com/OMPO (optional description here) (as of Feb. 16, 2012, 16:27). |
| AMA | OMPO. Acronym Geek. February 16, 2012, 16:27. Available at: http://www.acronymgeek.com/OMPO. Accessed February 16, 2012, 16:27. |