| APA | PIF. (2012, February 13). In Acronym Geek. Retrieved 23:21, February 13, 2012, from http://www.acronymgeek.com/PIF |
| MLA | "PIF." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PIF>. |
| MHRA | 'PIF', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PIF> [accessed 13 February 2012] |
| Chicago | "PIF", http://www.acronymgeek.com/PIF (accessed February 13, 2012). |
| CBE/CSE | PIF [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PIF. |
| Bluebook | PIF, http://www.acronymgeek.com/PIF (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PIF, http://www.acronymgeek.com/PIF (optional description here) (as of Feb. 13, 2012, 23:21). |
| AMA | PIF. Acronym Geek. February 13, 2012, 23:21. Available at: http://www.acronymgeek.com/PIF. Accessed February 13, 2012, 23:21. |