| APA | HP. (2012, February 14). In Acronym Geek. Retrieved 06:55, February 14, 2012, from http://www.acronymgeek.com/HP |
| MLA | "HP." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HP>. |
| MHRA | 'HP', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HP> [accessed 14 February 2012] |
| Chicago | "HP", http://www.acronymgeek.com/HP (accessed February 14, 2012). |
| CBE/CSE | HP [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HP. |
| Bluebook | HP, http://www.acronymgeek.com/HP (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HP, http://www.acronymgeek.com/HP (optional description here) (as of Feb. 14, 2012, 06:55). |
| AMA | HP. Acronym Geek. February 14, 2012, 06:55. Available at: http://www.acronymgeek.com/HP. Accessed February 14, 2012, 06:55. |