| APA | HKN. (2012, February 15). In Acronym Geek. Retrieved 03:45, February 15, 2012, from http://www.acronymgeek.com/HKN |
| MLA | "HKN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HKN>. |
| MHRA | 'HKN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HKN> [accessed 15 February 2012] |
| Chicago | "HKN", http://www.acronymgeek.com/HKN (accessed February 15, 2012). |
| CBE/CSE | HKN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HKN. |
| Bluebook | HKN, http://www.acronymgeek.com/HKN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKN, http://www.acronymgeek.com/HKN (optional description here) (as of Feb. 15, 2012, 03:45). |
| AMA | HKN. Acronym Geek. February 15, 2012, 03:45. Available at: http://www.acronymgeek.com/HKN. Accessed February 15, 2012, 03:45. |