| APA | HPF. (2012, February 14). In Acronym Geek. Retrieved 11:23, February 14, 2012, from http://www.acronymgeek.com/HPF |
| MLA | "HPF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HPF>. |
| MHRA | 'HPF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HPF> [accessed 14 February 2012] |
| Chicago | "HPF", http://www.acronymgeek.com/HPF (accessed February 14, 2012). |
| CBE/CSE | HPF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HPF. |
| Bluebook | HPF, http://www.acronymgeek.com/HPF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HPF, http://www.acronymgeek.com/HPF (optional description here) (as of Feb. 14, 2012, 11:23). |
| AMA | HPF. Acronym Geek. February 14, 2012, 11:23. Available at: http://www.acronymgeek.com/HPF. Accessed February 14, 2012, 11:23. |