| APA | GPN. (2012, February 9). In Acronym Geek. Retrieved 19:46, February 9, 2012, from http://www.acronymgeek.com/GPN |
| MLA | "GPN." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/GPN>. |
| MHRA | 'GPN', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/GPN> [accessed 9 February 2012] |
| Chicago | "GPN", http://www.acronymgeek.com/GPN (accessed February 9, 2012). |
| CBE/CSE | GPN [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/GPN. |
| Bluebook | GPN, http://www.acronymgeek.com/GPN (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPN, http://www.acronymgeek.com/GPN (optional description here) (as of Feb. 9, 2012, 19:46). |
| AMA | GPN. Acronym Geek. February 9, 2012, 19:46. Available at: http://www.acronymgeek.com/GPN. Accessed February 9, 2012, 19:46. |