| APA | HTPA. (2012, February 12). In Acronym Geek. Retrieved 06:02, February 12, 2012, from http://www.acronymgeek.com/HTPA |
| MLA | "HTPA." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HTPA>. |
| MHRA | 'HTPA', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HTPA> [accessed 12 February 2012] |
| Chicago | "HTPA", http://www.acronymgeek.com/HTPA (accessed February 12, 2012). |
| CBE/CSE | HTPA [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HTPA. |
| Bluebook | HTPA, http://www.acronymgeek.com/HTPA (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTPA, http://www.acronymgeek.com/HTPA (optional description here) (as of Feb. 12, 2012, 06:02). |
| AMA | HTPA. Acronym Geek. February 12, 2012, 06:02. Available at: http://www.acronymgeek.com/HTPA. Accessed February 12, 2012, 06:02. |