| APA | NPOES. (2012, February 12). In Acronym Geek. Retrieved 15:23, February 12, 2012, from http://www.acronymgeek.com/NPOES |
| MLA | "NPOES." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/NPOES>. |
| MHRA | 'NPOES', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/NPOES> [accessed 12 February 2012] |
| Chicago | "NPOES", http://www.acronymgeek.com/NPOES (accessed February 12, 2012). |
| CBE/CSE | NPOES [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/NPOES. |
| Bluebook | NPOES, http://www.acronymgeek.com/NPOES (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NPOES, http://www.acronymgeek.com/NPOES (optional description here) (as of Feb. 12, 2012, 15:23). |
| AMA | NPOES. Acronym Geek. February 12, 2012, 15:23. Available at: http://www.acronymgeek.com/NPOES. Accessed February 12, 2012, 15:23. |