| APA | PTHA. (2012, February 17). In Acronym Geek. Retrieved 06:30, February 17, 2012, from http://www.acronymgeek.com/PTHA |
| MLA | "PTHA." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PTHA>. |
| MHRA | 'PTHA', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PTHA> [accessed 17 February 2012] |
| Chicago | "PTHA", http://www.acronymgeek.com/PTHA (accessed February 17, 2012). |
| CBE/CSE | PTHA [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PTHA. |
| Bluebook | PTHA, http://www.acronymgeek.com/PTHA (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTHA, http://www.acronymgeek.com/PTHA (optional description here) (as of Feb. 17, 2012, 06:30). |
| AMA | PTHA. Acronym Geek. February 17, 2012, 06:30. Available at: http://www.acronymgeek.com/PTHA. Accessed February 17, 2012, 06:30. |