| APA | PTC. (2012, February 14). In Acronym Geek. Retrieved 20:40, February 14, 2012, from http://www.acronymgeek.com/PTC |
| MLA | "PTC." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PTC>. |
| MHRA | 'PTC', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PTC> [accessed 14 February 2012] |
| Chicago | "PTC", http://www.acronymgeek.com/PTC (accessed February 14, 2012). |
| CBE/CSE | PTC [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PTC. |
| Bluebook | PTC, http://www.acronymgeek.com/PTC (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTC, http://www.acronymgeek.com/PTC (optional description here) (as of Feb. 14, 2012, 20:40). |
| AMA | PTC. Acronym Geek. February 14, 2012, 20:40. Available at: http://www.acronymgeek.com/PTC. Accessed February 14, 2012, 20:40. |