| APA | OSPO. (2012, February 15). In Acronym Geek. Retrieved 01:37, February 15, 2012, from http://www.acronymgeek.com/OSPO |
| MLA | "OSPO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OSPO>. |
| MHRA | 'OSPO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OSPO> [accessed 15 February 2012] |
| Chicago | "OSPO", http://www.acronymgeek.com/OSPO (accessed February 15, 2012). |
| CBE/CSE | OSPO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OSPO. |
| Bluebook | OSPO, http://www.acronymgeek.com/OSPO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OSPO, http://www.acronymgeek.com/OSPO (optional description here) (as of Feb. 15, 2012, 01:37). |
| AMA | OSPO. Acronym Geek. February 15, 2012, 01:37. Available at: http://www.acronymgeek.com/OSPO. Accessed February 15, 2012, 01:37. |