| APA | GPD. (2012, February 14). In Acronym Geek. Retrieved 10:06, February 14, 2012, from http://www.acronymgeek.com/GPD |
| MLA | "GPD." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/GPD>. |
| MHRA | 'GPD', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/GPD> [accessed 14 February 2012] |
| Chicago | "GPD", http://www.acronymgeek.com/GPD (accessed February 14, 2012). |
| CBE/CSE | GPD [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/GPD. |
| Bluebook | GPD, http://www.acronymgeek.com/GPD (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPD, http://www.acronymgeek.com/GPD (optional description here) (as of Feb. 14, 2012, 10:06). |
| AMA | GPD. Acronym Geek. February 14, 2012, 10:06. Available at: http://www.acronymgeek.com/GPD. Accessed February 14, 2012, 10:06. |