| APA | PRF. (2012, February 13). In Acronym Geek. Retrieved 23:25, February 13, 2012, from http://www.acronymgeek.com/PRF |
| MLA | "PRF." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PRF>. |
| MHRA | 'PRF', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PRF> [accessed 13 February 2012] |
| Chicago | "PRF", http://www.acronymgeek.com/PRF (accessed February 13, 2012). |
| CBE/CSE | PRF [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PRF. |
| Bluebook | PRF, http://www.acronymgeek.com/PRF (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PRF, http://www.acronymgeek.com/PRF (optional description here) (as of Feb. 13, 2012, 23:25). |
| AMA | PRF. Acronym Geek. February 13, 2012, 23:25. Available at: http://www.acronymgeek.com/PRF. Accessed February 13, 2012, 23:25. |