| APA | SOPF. (2012, February 16). In Acronym Geek. Retrieved 07:51, February 16, 2012, from http://www.acronymgeek.com/SOPF |
| MLA | "SOPF." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/SOPF>. |
| MHRA | 'SOPF', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/SOPF> [accessed 16 February 2012] |
| Chicago | "SOPF", http://www.acronymgeek.com/SOPF (accessed February 16, 2012). |
| CBE/CSE | SOPF [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/SOPF. |
| Bluebook | SOPF, http://www.acronymgeek.com/SOPF (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SOPF, http://www.acronymgeek.com/SOPF (optional description here) (as of Feb. 16, 2012, 07:51). |
| AMA | SOPF. Acronym Geek. February 16, 2012, 07:51. Available at: http://www.acronymgeek.com/SOPF. Accessed February 16, 2012, 07:51. |