| APA | PYF. (2012, February 14). In Acronym Geek. Retrieved 07:49, February 14, 2012, from http://www.acronymgeek.com/PYF |
| MLA | "PYF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PYF>. |
| MHRA | 'PYF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PYF> [accessed 14 February 2012] |
| Chicago | "PYF", http://www.acronymgeek.com/PYF (accessed February 14, 2012). |
| CBE/CSE | PYF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PYF. |
| Bluebook | PYF, http://www.acronymgeek.com/PYF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PYF, http://www.acronymgeek.com/PYF (optional description here) (as of Feb. 14, 2012, 07:49). |
| AMA | PYF. Acronym Geek. February 14, 2012, 07:49. Available at: http://www.acronymgeek.com/PYF. Accessed February 14, 2012, 07:49. |