| APA | PFOI. (2012, February 17). In Acronym Geek. Retrieved 02:13, February 17, 2012, from http://www.acronymgeek.com/PFOI |
| MLA | "PFOI." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PFOI>. |
| MHRA | 'PFOI', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PFOI> [accessed 17 February 2012] |
| Chicago | "PFOI", http://www.acronymgeek.com/PFOI (accessed February 17, 2012). |
| CBE/CSE | PFOI [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PFOI. |
| Bluebook | PFOI, http://www.acronymgeek.com/PFOI (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PFOI, http://www.acronymgeek.com/PFOI (optional description here) (as of Feb. 17, 2012, 02:13). |
| AMA | PFOI. Acronym Geek. February 17, 2012, 02:13. Available at: http://www.acronymgeek.com/PFOI. Accessed February 17, 2012, 02:13. |