| APA | HPUE. (2012, February 15). In Acronym Geek. Retrieved 08:33, February 15, 2012, from http://www.acronymgeek.com/HPUE |
| MLA | "HPUE." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HPUE>. |
| MHRA | 'HPUE', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HPUE> [accessed 15 February 2012] |
| Chicago | "HPUE", http://www.acronymgeek.com/HPUE (accessed February 15, 2012). |
| CBE/CSE | HPUE [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HPUE. |
| Bluebook | HPUE, http://www.acronymgeek.com/HPUE (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HPUE, http://www.acronymgeek.com/HPUE (optional description here) (as of Feb. 15, 2012, 08:33). |
| AMA | HPUE. Acronym Geek. February 15, 2012, 08:33. Available at: http://www.acronymgeek.com/HPUE. Accessed February 15, 2012, 08:33. |