| APA | GPY. (2012, February 15). In Acronym Geek. Retrieved 03:22, February 15, 2012, from http://www.acronymgeek.com/GPY |
| MLA | "GPY." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GPY>. |
| MHRA | 'GPY', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GPY> [accessed 15 February 2012] |
| Chicago | "GPY", http://www.acronymgeek.com/GPY (accessed February 15, 2012). |
| CBE/CSE | GPY [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GPY. |
| Bluebook | GPY, http://www.acronymgeek.com/GPY (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPY, http://www.acronymgeek.com/GPY (optional description here) (as of Feb. 15, 2012, 03:22). |
| AMA | GPY. Acronym Geek. February 15, 2012, 03:22. Available at: http://www.acronymgeek.com/GPY. Accessed February 15, 2012, 03:22. |