| APA | H.P.. (2012, February 16). In Acronym Geek. Retrieved 03:56, February 16, 2012, from http://www.acronymgeek.com/H.P. |
| MLA | "H.P.." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/H.P.>. |
| MHRA | 'H.P.', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/H.P.> [accessed 16 February 2012] |
| Chicago | "H.P.", http://www.acronymgeek.com/H.P. (accessed February 16, 2012). |
| CBE/CSE | H.P. [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/H.P.. |
| Bluebook | H.P., http://www.acronymgeek.com/H.P. (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, H.P., http://www.acronymgeek.com/H.P. (optional description here) (as of Feb. 16, 2012, 03:56). |
| AMA | H.P.. Acronym Geek. February 16, 2012, 03:56. Available at: http://www.acronymgeek.com/H.P.. Accessed February 16, 2012, 03:56. |