| APA | PTHC. (2012, February 9). In Acronym Geek. Retrieved 14:04, February 9, 2012, from http://www.acronymgeek.com/PTHC |
| MLA | "PTHC." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/PTHC>. |
| MHRA | 'PTHC', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/PTHC> [accessed 9 February 2012] |
| Chicago | "PTHC", http://www.acronymgeek.com/PTHC (accessed February 9, 2012). |
| CBE/CSE | PTHC [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/PTHC. |
| Bluebook | PTHC, http://www.acronymgeek.com/PTHC (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTHC, http://www.acronymgeek.com/PTHC (optional description here) (as of Feb. 9, 2012, 14:04). |
| AMA | PTHC. Acronym Geek. February 9, 2012, 14:04. Available at: http://www.acronymgeek.com/PTHC. Accessed February 9, 2012, 14:04. |