| APA | SOPIF. (2012, February 12). In Acronym Geek. Retrieved 07:29, February 12, 2012, from http://www.acronymgeek.com/SOPIF |
| MLA | "SOPIF." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/SOPIF>. |
| MHRA | 'SOPIF', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/SOPIF> [accessed 12 February 2012] |
| Chicago | "SOPIF", http://www.acronymgeek.com/SOPIF (accessed February 12, 2012). |
| CBE/CSE | SOPIF [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/SOPIF. |
| Bluebook | SOPIF, http://www.acronymgeek.com/SOPIF (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SOPIF, http://www.acronymgeek.com/SOPIF (optional description here) (as of Feb. 12, 2012, 07:29). |
| AMA | SOPIF. Acronym Geek. February 12, 2012, 07:29. Available at: http://www.acronymgeek.com/SOPIF. Accessed February 12, 2012, 07:29. |