| APA | OPOC. (2012, February 15). In Acronym Geek. Retrieved 07:39, February 15, 2012, from http://www.acronymgeek.com/OPOC |
| MLA | "OPOC." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OPOC>. |
| MHRA | 'OPOC', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OPOC> [accessed 15 February 2012] |
| Chicago | "OPOC", http://www.acronymgeek.com/OPOC (accessed February 15, 2012). |
| CBE/CSE | OPOC [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OPOC. |
| Bluebook | OPOC, http://www.acronymgeek.com/OPOC (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPOC, http://www.acronymgeek.com/OPOC (optional description here) (as of Feb. 15, 2012, 07:39). |
| AMA | OPOC. Acronym Geek. February 15, 2012, 07:39. Available at: http://www.acronymgeek.com/OPOC. Accessed February 15, 2012, 07:39. |