| APA | SOPX. (2012, February 15). In Acronym Geek. Retrieved 17:53, February 15, 2012, from http://www.acronymgeek.com/SOPX |
| MLA | "SOPX." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/SOPX>. |
| MHRA | 'SOPX', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/SOPX> [accessed 15 February 2012] |
| Chicago | "SOPX", http://www.acronymgeek.com/SOPX (accessed February 15, 2012). |
| CBE/CSE | SOPX [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/SOPX. |
| Bluebook | SOPX, http://www.acronymgeek.com/SOPX (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SOPX, http://www.acronymgeek.com/SOPX (optional description here) (as of Feb. 15, 2012, 17:53). |
| AMA | SOPX. Acronym Geek. February 15, 2012, 17:53. Available at: http://www.acronymgeek.com/SOPX. Accessed February 15, 2012, 17:53. |