| APA | PREF. (2012, February 14). In Acronym Geek. Retrieved 18:29, February 14, 2012, from http://www.acronymgeek.com/PREF |
| MLA | "PREF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PREF>. |
| MHRA | 'PREF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PREF> [accessed 14 February 2012] |
| Chicago | "PREF", http://www.acronymgeek.com/PREF (accessed February 14, 2012). |
| CBE/CSE | PREF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PREF. |
| Bluebook | PREF, http://www.acronymgeek.com/PREF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PREF, http://www.acronymgeek.com/PREF (optional description here) (as of Feb. 14, 2012, 18:29). |
| AMA | PREF. Acronym Geek. February 14, 2012, 18:29. Available at: http://www.acronymgeek.com/PREF. Accessed February 14, 2012, 18:29. |