| APA | PGD. (2012, February 14). In Acronym Geek. Retrieved 10:29, February 14, 2012, from http://www.acronymgeek.com/PGD |
| MLA | "PGD." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PGD>. |
| MHRA | 'PGD', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PGD> [accessed 14 February 2012] |
| Chicago | "PGD", http://www.acronymgeek.com/PGD (accessed February 14, 2012). |
| CBE/CSE | PGD [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PGD. |
| Bluebook | PGD, http://www.acronymgeek.com/PGD (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PGD, http://www.acronymgeek.com/PGD (optional description here) (as of Feb. 14, 2012, 10:29). |
| AMA | PGD. Acronym Geek. February 14, 2012, 10:29. Available at: http://www.acronymgeek.com/PGD. Accessed February 14, 2012, 10:29. |