| APA | NPO. (2012, February 10). In Acronym Geek. Retrieved 08:28, February 10, 2012, from http://www.acronymgeek.com/NPO |
| MLA | "NPO." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/NPO>. |
| MHRA | 'NPO', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/NPO> [accessed 10 February 2012] |
| Chicago | "NPO", http://www.acronymgeek.com/NPO (accessed February 10, 2012). |
| CBE/CSE | NPO [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/NPO. |
| Bluebook | NPO, http://www.acronymgeek.com/NPO (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPO, http://www.acronymgeek.com/NPO (optional description here) (as of Feb. 10, 2012, 08:28). |
| AMA | NPO. Acronym Geek. February 10, 2012, 08:28. Available at: http://www.acronymgeek.com/NPO. Accessed February 10, 2012, 08:28. |