| APA | HTPN. (2012, February 12). In Acronym Geek. Retrieved 10:18, February 12, 2012, from http://www.acronymgeek.com/HTPN |
| MLA | "HTPN." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HTPN>. |
| MHRA | 'HTPN', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HTPN> [accessed 12 February 2012] |
| Chicago | "HTPN", http://www.acronymgeek.com/HTPN (accessed February 12, 2012). |
| CBE/CSE | HTPN [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HTPN. |
| Bluebook | HTPN, http://www.acronymgeek.com/HTPN (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTPN, http://www.acronymgeek.com/HTPN (optional description here) (as of Feb. 12, 2012, 10:18). |
| AMA | HTPN. Acronym Geek. February 12, 2012, 10:18. Available at: http://www.acronymgeek.com/HTPN. Accessed February 12, 2012, 10:18. |