| APA | PNR. (2012, February 15). In Acronym Geek. Retrieved 03:35, February 15, 2012, from http://www.acronymgeek.com/PNR |
| MLA | "PNR." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PNR>. |
| MHRA | 'PNR', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PNR> [accessed 15 February 2012] |
| Chicago | "PNR", http://www.acronymgeek.com/PNR (accessed February 15, 2012). |
| CBE/CSE | PNR [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PNR. |
| Bluebook | PNR, http://www.acronymgeek.com/PNR (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PNR, http://www.acronymgeek.com/PNR (optional description here) (as of Feb. 15, 2012, 03:35). |
| AMA | PNR. Acronym Geek. February 15, 2012, 03:35. Available at: http://www.acronymgeek.com/PNR. Accessed February 15, 2012, 03:35. |