| APA | HTPL. (2012, February 11). In Acronym Geek. Retrieved 20:31, February 11, 2012, from http://www.acronymgeek.com/HTPL |
| MLA | "HTPL." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/HTPL>. |
| MHRA | 'HTPL', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/HTPL> [accessed 11 February 2012] |
| Chicago | "HTPL", http://www.acronymgeek.com/HTPL (accessed February 11, 2012). |
| CBE/CSE | HTPL [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/HTPL. |
| Bluebook | HTPL, http://www.acronymgeek.com/HTPL (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTPL, http://www.acronymgeek.com/HTPL (optional description here) (as of Feb. 11, 2012, 20:31). |
| AMA | HTPL. Acronym Geek. February 11, 2012, 20:31. Available at: http://www.acronymgeek.com/HTPL. Accessed February 11, 2012, 20:31. |