| APA | PTCK. (2012, February 16). In Acronym Geek. Retrieved 19:58, February 16, 2012, from http://www.acronymgeek.com/PTCK |
| MLA | "PTCK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PTCK>. |
| MHRA | 'PTCK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PTCK> [accessed 16 February 2012] |
| Chicago | "PTCK", http://www.acronymgeek.com/PTCK (accessed February 16, 2012). |
| CBE/CSE | PTCK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PTCK. |
| Bluebook | PTCK, http://www.acronymgeek.com/PTCK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTCK, http://www.acronymgeek.com/PTCK (optional description here) (as of Feb. 16, 2012, 19:58). |
| AMA | PTCK. Acronym Geek. February 16, 2012, 19:58. Available at: http://www.acronymgeek.com/PTCK. Accessed February 16, 2012, 19:58. |