| APA | GPZ. (2012, February 13). In Acronym Geek. Retrieved 23:23, February 13, 2012, from http://www.acronymgeek.com/GPZ |
| MLA | "GPZ." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/GPZ>. |
| MHRA | 'GPZ', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/GPZ> [accessed 13 February 2012] |
| Chicago | "GPZ", http://www.acronymgeek.com/GPZ (accessed February 13, 2012). |
| CBE/CSE | GPZ [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/GPZ. |
| Bluebook | GPZ, http://www.acronymgeek.com/GPZ (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPZ, http://www.acronymgeek.com/GPZ (optional description here) (as of Feb. 13, 2012, 23:23). |
| AMA | GPZ. Acronym Geek. February 13, 2012, 23:23. Available at: http://www.acronymgeek.com/GPZ. Accessed February 13, 2012, 23:23. |