| APA | PSPO. (2012, February 17). In Acronym Geek. Retrieved 06:50, February 17, 2012, from http://www.acronymgeek.com/PSPO |
| MLA | "PSPO." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PSPO>. |
| MHRA | 'PSPO', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PSPO> [accessed 17 February 2012] |
| Chicago | "PSPO", http://www.acronymgeek.com/PSPO (accessed February 17, 2012). |
| CBE/CSE | PSPO [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PSPO. |
| Bluebook | PSPO, http://www.acronymgeek.com/PSPO (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PSPO, http://www.acronymgeek.com/PSPO (optional description here) (as of Feb. 17, 2012, 06:50). |
| AMA | PSPO. Acronym Geek. February 17, 2012, 06:50. Available at: http://www.acronymgeek.com/PSPO. Accessed February 17, 2012, 06:50. |