| APA | PFEF. (2012, February 15). In Acronym Geek. Retrieved 09:50, February 15, 2012, from http://www.acronymgeek.com/PFEF |
| MLA | "PFEF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PFEF>. |
| MHRA | 'PFEF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PFEF> [accessed 15 February 2012] |
| Chicago | "PFEF", http://www.acronymgeek.com/PFEF (accessed February 15, 2012). |
| CBE/CSE | PFEF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PFEF. |
| Bluebook | PFEF, http://www.acronymgeek.com/PFEF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PFEF, http://www.acronymgeek.com/PFEF (optional description here) (as of Feb. 15, 2012, 09:50). |
| AMA | PFEF. Acronym Geek. February 15, 2012, 09:50. Available at: http://www.acronymgeek.com/PFEF. Accessed February 15, 2012, 09:50. |