| APA | PTGL. (2012, February 14). In Acronym Geek. Retrieved 20:26, February 14, 2012, from http://www.acronymgeek.com/PTGL |
| MLA | "PTGL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PTGL>. |
| MHRA | 'PTGL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PTGL> [accessed 14 February 2012] |
| Chicago | "PTGL", http://www.acronymgeek.com/PTGL (accessed February 14, 2012). |
| CBE/CSE | PTGL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PTGL. |
| Bluebook | PTGL, http://www.acronymgeek.com/PTGL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTGL, http://www.acronymgeek.com/PTGL (optional description here) (as of Feb. 14, 2012, 20:26). |
| AMA | PTGL. Acronym Geek. February 14, 2012, 20:26. Available at: http://www.acronymgeek.com/PTGL. Accessed February 14, 2012, 20:26. |