| APA | OPWI. (2012, February 16). In Acronym Geek. Retrieved 03:14, February 16, 2012, from http://www.acronymgeek.com/OPWI |
| MLA | "OPWI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OPWI>. |
| MHRA | 'OPWI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OPWI> [accessed 16 February 2012] |
| Chicago | "OPWI", http://www.acronymgeek.com/OPWI (accessed February 16, 2012). |
| CBE/CSE | OPWI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OPWI. |
| Bluebook | OPWI, http://www.acronymgeek.com/OPWI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPWI, http://www.acronymgeek.com/OPWI (optional description here) (as of Feb. 16, 2012, 03:14). |
| AMA | OPWI. Acronym Geek. February 16, 2012, 03:14. Available at: http://www.acronymgeek.com/OPWI. Accessed February 16, 2012, 03:14. |