| APA | GPPK. (2012, February 16). In Acronym Geek. Retrieved 00:06, February 16, 2012, from http://www.acronymgeek.com/GPPK |
| MLA | "GPPK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/GPPK>. |
| MHRA | 'GPPK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/GPPK> [accessed 16 February 2012] |
| Chicago | "GPPK", http://www.acronymgeek.com/GPPK (accessed February 16, 2012). |
| CBE/CSE | GPPK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/GPPK. |
| Bluebook | GPPK, http://www.acronymgeek.com/GPPK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPPK, http://www.acronymgeek.com/GPPK (optional description here) (as of Feb. 16, 2012, 00:06). |
| AMA | GPPK. Acronym Geek. February 16, 2012, 00:06. Available at: http://www.acronymgeek.com/GPPK. Accessed February 16, 2012, 00:06. |