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