| APA | OPUR. (2012, February 14). In Acronym Geek. Retrieved 17:46, February 14, 2012, from http://www.acronymgeek.com/OPUR |
| MLA | "OPUR." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OPUR>. |
| MHRA | 'OPUR', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OPUR> [accessed 14 February 2012] |
| Chicago | "OPUR", http://www.acronymgeek.com/OPUR (accessed February 14, 2012). |
| CBE/CSE | OPUR [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OPUR. |
| Bluebook | OPUR, http://www.acronymgeek.com/OPUR (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPUR, http://www.acronymgeek.com/OPUR (optional description here) (as of Feb. 14, 2012, 17:46). |
| AMA | OPUR. Acronym Geek. February 14, 2012, 17:46. Available at: http://www.acronymgeek.com/OPUR. Accessed February 14, 2012, 17:46. |