| APA | PTGD. (2012, February 14). In Acronym Geek. Retrieved 23:37, February 14, 2012, from http://www.acronymgeek.com/PTGD |
| MLA | "PTGD." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PTGD>. |
| MHRA | 'PTGD', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PTGD> [accessed 14 February 2012] |
| Chicago | "PTGD", http://www.acronymgeek.com/PTGD (accessed February 14, 2012). |
| CBE/CSE | PTGD [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PTGD. |
| Bluebook | PTGD, http://www.acronymgeek.com/PTGD (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTGD, http://www.acronymgeek.com/PTGD (optional description here) (as of Feb. 14, 2012, 23:37). |
| AMA | PTGD. Acronym Geek. February 14, 2012, 23:37. Available at: http://www.acronymgeek.com/PTGD. Accessed February 14, 2012, 23:37. |