| APA | HPFE. (2012, February 16). In Acronym Geek. Retrieved 11:04, February 16, 2012, from http://www.acronymgeek.com/HPFE |
| MLA | "HPFE." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HPFE>. |
| MHRA | 'HPFE', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HPFE> [accessed 16 February 2012] |
| Chicago | "HPFE", http://www.acronymgeek.com/HPFE (accessed February 16, 2012). |
| CBE/CSE | HPFE [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HPFE. |
| Bluebook | HPFE, http://www.acronymgeek.com/HPFE (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HPFE, http://www.acronymgeek.com/HPFE (optional description here) (as of Feb. 16, 2012, 11:04). |
| AMA | HPFE. Acronym Geek. February 16, 2012, 11:04. Available at: http://www.acronymgeek.com/HPFE. Accessed February 16, 2012, 11:04. |