| APA | ONPE. (2012, February 16). In Acronym Geek. Retrieved 23:37, February 16, 2012, from http://www.acronymgeek.com/ONPE |
| MLA | "ONPE." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ONPE>. |
| MHRA | 'ONPE', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ONPE> [accessed 16 February 2012] |
| Chicago | "ONPE", http://www.acronymgeek.com/ONPE (accessed February 16, 2012). |
| CBE/CSE | ONPE [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ONPE. |
| Bluebook | ONPE, http://www.acronymgeek.com/ONPE (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ONPE, http://www.acronymgeek.com/ONPE (optional description here) (as of Feb. 16, 2012, 23:37). |
| AMA | ONPE. Acronym Geek. February 16, 2012, 23:37. Available at: http://www.acronymgeek.com/ONPE. Accessed February 16, 2012, 23:37. |