| APA | PTHK. (2012, February 16). In Acronym Geek. Retrieved 02:26, February 16, 2012, from http://www.acronymgeek.com/PTHK |
| MLA | "PTHK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PTHK>. |
| MHRA | 'PTHK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PTHK> [accessed 16 February 2012] |
| Chicago | "PTHK", http://www.acronymgeek.com/PTHK (accessed February 16, 2012). |
| CBE/CSE | PTHK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PTHK. |
| Bluebook | PTHK, http://www.acronymgeek.com/PTHK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTHK, http://www.acronymgeek.com/PTHK (optional description here) (as of Feb. 16, 2012, 02:26). |
| AMA | PTHK. Acronym Geek. February 16, 2012, 02:26. Available at: http://www.acronymgeek.com/PTHK. Accessed February 16, 2012, 02:26. |