| APA | PHF. (2012, February 14). In Acronym Geek. Retrieved 06:42, February 14, 2012, from http://www.acronymgeek.com/PHF |
| MLA | "PHF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PHF>. |
| MHRA | 'PHF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PHF> [accessed 14 February 2012] |
| Chicago | "PHF", http://www.acronymgeek.com/PHF (accessed February 14, 2012). |
| CBE/CSE | PHF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PHF. |
| Bluebook | PHF, http://www.acronymgeek.com/PHF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PHF, http://www.acronymgeek.com/PHF (optional description here) (as of Feb. 14, 2012, 06:42). |
| AMA | PHF. Acronym Geek. February 14, 2012, 06:42. Available at: http://www.acronymgeek.com/PHF. Accessed February 14, 2012, 06:42. |