| APA | HPKN. (2012, February 16). In Acronym Geek. Retrieved 07:52, February 16, 2012, from http://www.acronymgeek.com/HPKN |
| MLA | "HPKN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HPKN>. |
| MHRA | 'HPKN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HPKN> [accessed 16 February 2012] |
| Chicago | "HPKN", http://www.acronymgeek.com/HPKN (accessed February 16, 2012). |
| CBE/CSE | HPKN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HPKN. |
| Bluebook | HPKN, http://www.acronymgeek.com/HPKN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HPKN, http://www.acronymgeek.com/HPKN (optional description here) (as of Feb. 16, 2012, 07:52). |
| AMA | HPKN. Acronym Geek. February 16, 2012, 07:52. Available at: http://www.acronymgeek.com/HPKN. Accessed February 16, 2012, 07:52. |