| Style | Reference Text |
|---|
| APA | NPO. (2009, November 28). In All Acronyms. Retrieved 22:11, November 28, 2009, from http://www.all-acronyms.com/cat/1/NPO |
| MLA | "NPO." All Acronyms. 28 Nov 2009, 22:11. All Acronyms. 28 Nov 2009 <http://www.all-acronyms.com/cat/1/NPO>. |
| MHRA | 'NPO', All Acronyms, 28 November 2009, 22:11, <http://www.all-acronyms.com/cat/1/NPO> [accessed 28 November 2009] |
| Chicago | "NPO," http://www.all-acronyms.com/cat/1/NPO (accessed November 28, 2009). |
| CBE/CSE | NPO [Internet]. All Acronyms; 2009 Nov 28, 22:11 [cited 2009 Nov 28]. Available from: http://www.all-acronyms.com/cat/1/NPO. |
| Bluebook | NPO, http://www.all-acronyms.com/cat/1/NPO (last visited November 28, 2009). |
| Bluebook: Harvard JOLT | See All Acronyms, NPO, http://www.all-acronyms.com/cat/1/NPO (optional description here) (as of Nov. 28, 2009, 22:11). |
| AMA | NPO. All Acronyms. November 28, 2009, 22:11. Available at: http://www.all-acronyms.com/cat/1/NPO. Accessed November 28, 2009. |
Negative/POsitive zero