| APA | HAK. (2012, February 10). In Acronym Geek. Retrieved 11:01, February 10, 2012, from http://www.acronymgeek.com/HAK |
| MLA | "HAK." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/HAK>. |
| MHRA | 'HAK', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/HAK> [accessed 10 February 2012] |
| Chicago | "HAK", http://www.acronymgeek.com/HAK (accessed February 10, 2012). |
| CBE/CSE | HAK [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/HAK. |
| Bluebook | HAK, http://www.acronymgeek.com/HAK (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HAK, http://www.acronymgeek.com/HAK (optional description here) (as of Feb. 10, 2012, 11:01). |
| AMA | HAK. Acronym Geek. February 10, 2012, 11:01. Available at: http://www.acronymgeek.com/HAK. Accessed February 10, 2012, 11:01. |