| APA | OK. (2012, February 10). In Acronym Geek. Retrieved 07:16, February 10, 2012, from http://www.acronymgeek.com/OK |
| MLA | "OK." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/OK>. |
| MHRA | 'OK', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/OK> [accessed 10 February 2012] |
| Chicago | "OK", http://www.acronymgeek.com/OK (accessed February 10, 2012). |
| CBE/CSE | OK [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/OK. |
| Bluebook | OK, http://www.acronymgeek.com/OK (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OK, http://www.acronymgeek.com/OK (optional description here) (as of Feb. 10, 2012, 07:16). |
| AMA | OK. Acronym Geek. February 10, 2012, 07:16. Available at: http://www.acronymgeek.com/OK. Accessed February 10, 2012, 07:16. |