| APA | PTG. (2012, February 13). In Acronym Geek. Retrieved 23:09, February 13, 2012, from http://www.acronymgeek.com/PTG |
| MLA | "PTG." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PTG>. |
| MHRA | 'PTG', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PTG> [accessed 13 February 2012] |
| Chicago | "PTG", http://www.acronymgeek.com/PTG (accessed February 13, 2012). |
| CBE/CSE | PTG [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PTG. |
| Bluebook | PTG, http://www.acronymgeek.com/PTG (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTG, http://www.acronymgeek.com/PTG (optional description here) (as of Feb. 13, 2012, 23:09). |
| AMA | PTG. Acronym Geek. February 13, 2012, 23:09. Available at: http://www.acronymgeek.com/PTG. Accessed February 13, 2012, 23:09. |