| APA | OPWA. (2012, February 16). In Acronym Geek. Retrieved 10:16, February 16, 2012, from http://www.acronymgeek.com/OPWA |
| MLA | "OPWA." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OPWA>. |
| MHRA | 'OPWA', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OPWA> [accessed 16 February 2012] |
| Chicago | "OPWA", http://www.acronymgeek.com/OPWA (accessed February 16, 2012). |
| CBE/CSE | OPWA [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OPWA. |
| Bluebook | OPWA, http://www.acronymgeek.com/OPWA (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPWA, http://www.acronymgeek.com/OPWA (optional description here) (as of Feb. 16, 2012, 10:16). |
| AMA | OPWA. Acronym Geek. February 16, 2012, 10:16. Available at: http://www.acronymgeek.com/OPWA. Accessed February 16, 2012, 10:16. |