| APA | PTGF. (2012, February 16). In Acronym Geek. Retrieved 01:57, February 16, 2012, from http://www.acronymgeek.com/PTGF |
| MLA | "PTGF." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PTGF>. |
| MHRA | 'PTGF', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PTGF> [accessed 16 February 2012] |
| Chicago | "PTGF", http://www.acronymgeek.com/PTGF (accessed February 16, 2012). |
| CBE/CSE | PTGF [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PTGF. |
| Bluebook | PTGF, http://www.acronymgeek.com/PTGF (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTGF, http://www.acronymgeek.com/PTGF (optional description here) (as of Feb. 16, 2012, 01:57). |
| AMA | PTGF. Acronym Geek. February 16, 2012, 01:57. Available at: http://www.acronymgeek.com/PTGF. Accessed February 16, 2012, 01:57. |