| APA | NPA. (2012, February 15). In Acronym Geek. Retrieved 03:33, February 15, 2012, from http://www.acronymgeek.com/NPA |
| MLA | "NPA." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/NPA>. |
| MHRA | 'NPA', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/NPA> [accessed 15 February 2012] |
| Chicago | "NPA", http://www.acronymgeek.com/NPA (accessed February 15, 2012). |
| CBE/CSE | NPA [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/NPA. |
| Bluebook | NPA, http://www.acronymgeek.com/NPA (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPA, http://www.acronymgeek.com/NPA (optional description here) (as of Feb. 15, 2012, 03:33). |
| AMA | NPA. Acronym Geek. February 15, 2012, 03:33. Available at: http://www.acronymgeek.com/NPA. Accessed February 15, 2012, 03:33. |