| APA | PNN. (2012, February 14). In Acronym Geek. Retrieved 09:37, February 14, 2012, from http://www.acronymgeek.com/PNN |
| MLA | "PNN." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PNN>. |
| MHRA | 'PNN', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PNN> [accessed 14 February 2012] |
| Chicago | "PNN", http://www.acronymgeek.com/PNN (accessed February 14, 2012). |
| CBE/CSE | PNN [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PNN. |
| Bluebook | PNN, http://www.acronymgeek.com/PNN (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PNN, http://www.acronymgeek.com/PNN (optional description here) (as of Feb. 14, 2012, 09:37). |
| AMA | PNN. Acronym Geek. February 14, 2012, 09:37. Available at: http://www.acronymgeek.com/PNN. Accessed February 14, 2012, 09:37. |