| APA | HTPI. (2012, February 12). In Acronym Geek. Retrieved 04:14, February 12, 2012, from http://www.acronymgeek.com/HTPI |
| MLA | "HTPI." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HTPI>. |
| MHRA | 'HTPI', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HTPI> [accessed 12 February 2012] |
| Chicago | "HTPI", http://www.acronymgeek.com/HTPI (accessed February 12, 2012). |
| CBE/CSE | HTPI [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HTPI. |
| Bluebook | HTPI, http://www.acronymgeek.com/HTPI (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTPI, http://www.acronymgeek.com/HTPI (optional description here) (as of Feb. 12, 2012, 04:14). |
| AMA | HTPI. Acronym Geek. February 12, 2012, 04:14. Available at: http://www.acronymgeek.com/HTPI. Accessed February 12, 2012, 04:14. |