| APA | OPNW. (2012, February 16). In Acronym Geek. Retrieved 04:50, February 16, 2012, from http://www.acronymgeek.com/OPNW |
| MLA | "OPNW." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OPNW>. |
| MHRA | 'OPNW', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OPNW> [accessed 16 February 2012] |
| Chicago | "OPNW", http://www.acronymgeek.com/OPNW (accessed February 16, 2012). |
| CBE/CSE | OPNW [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OPNW. |
| Bluebook | OPNW, http://www.acronymgeek.com/OPNW (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPNW, http://www.acronymgeek.com/OPNW (optional description here) (as of Feb. 16, 2012, 04:50). |
| AMA | OPNW. Acronym Geek. February 16, 2012, 04:50. Available at: http://www.acronymgeek.com/OPNW. Accessed February 16, 2012, 04:50. |