| APA | GPKI. (2012, February 14). In Acronym Geek. Retrieved 00:37, February 14, 2012, from http://www.acronymgeek.com/GPKI |
| MLA | "GPKI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/GPKI>. |
| MHRA | 'GPKI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/GPKI> [accessed 14 February 2012] |
| Chicago | "GPKI", http://www.acronymgeek.com/GPKI (accessed February 14, 2012). |
| CBE/CSE | GPKI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/GPKI. |
| Bluebook | GPKI, http://www.acronymgeek.com/GPKI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPKI, http://www.acronymgeek.com/GPKI (optional description here) (as of Feb. 14, 2012, 00:37). |
| AMA | GPKI. Acronym Geek. February 14, 2012, 00:37. Available at: http://www.acronymgeek.com/GPKI. Accessed February 14, 2012, 00:37. |