| APA | OPWK. (2012, February 16). In Acronym Geek. Retrieved 19:29, February 16, 2012, from http://www.acronymgeek.com/OPWK |
| MLA | "OPWK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OPWK>. |
| MHRA | 'OPWK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OPWK> [accessed 16 February 2012] |
| Chicago | "OPWK", http://www.acronymgeek.com/OPWK (accessed February 16, 2012). |
| CBE/CSE | OPWK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OPWK. |
| Bluebook | OPWK, http://www.acronymgeek.com/OPWK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPWK, http://www.acronymgeek.com/OPWK (optional description here) (as of Feb. 16, 2012, 19:29). |
| AMA | OPWK. Acronym Geek. February 16, 2012, 19:29. Available at: http://www.acronymgeek.com/OPWK. Accessed February 16, 2012, 19:29. |