| APA | OKH. (2012, February 14). In Acronym Geek. Retrieved 09:04, February 14, 2012, from http://www.acronymgeek.com/OKH |
| MLA | "OKH." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OKH>. |
| MHRA | 'OKH', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OKH> [accessed 14 February 2012] |
| Chicago | "OKH", http://www.acronymgeek.com/OKH (accessed February 14, 2012). |
| CBE/CSE | OKH [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OKH. |
| Bluebook | OKH, http://www.acronymgeek.com/OKH (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OKH, http://www.acronymgeek.com/OKH (optional description here) (as of Feb. 14, 2012, 09:04). |
| AMA | OKH. Acronym Geek. February 14, 2012, 09:04. Available at: http://www.acronymgeek.com/OKH. Accessed February 14, 2012, 09:04. |