| APA | PTGR. (2012, February 15). In Acronym Geek. Retrieved 13:13, February 15, 2012, from http://www.acronymgeek.com/PTGR |
| MLA | "PTGR." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PTGR>. |
| MHRA | 'PTGR', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PTGR> [accessed 15 February 2012] |
| Chicago | "PTGR", http://www.acronymgeek.com/PTGR (accessed February 15, 2012). |
| CBE/CSE | PTGR [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PTGR. |
| Bluebook | PTGR, http://www.acronymgeek.com/PTGR (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTGR, http://www.acronymgeek.com/PTGR (optional description here) (as of Feb. 15, 2012, 13:13). |
| AMA | PTGR. Acronym Geek. February 15, 2012, 13:13. Available at: http://www.acronymgeek.com/PTGR. Accessed February 15, 2012, 13:13. |