| APA | OKC. (2012, February 14). In Acronym Geek. Retrieved 11:21, February 14, 2012, from http://www.acronymgeek.com/OKC |
| MLA | "OKC." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OKC>. |
| MHRA | 'OKC', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OKC> [accessed 14 February 2012] |
| Chicago | "OKC", http://www.acronymgeek.com/OKC (accessed February 14, 2012). |
| CBE/CSE | OKC [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OKC. |
| Bluebook | OKC, http://www.acronymgeek.com/OKC (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OKC, http://www.acronymgeek.com/OKC (optional description here) (as of Feb. 14, 2012, 11:21). |
| AMA | OKC. Acronym Geek. February 14, 2012, 11:21. Available at: http://www.acronymgeek.com/OKC. Accessed February 14, 2012, 11:21. |