| APA | HCKA. (2012, February 16). In Acronym Geek. Retrieved 00:58, February 16, 2012, from http://www.acronymgeek.com/HCKA |
| MLA | "HCKA." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HCKA>. |
| MHRA | 'HCKA', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HCKA> [accessed 16 February 2012] |
| Chicago | "HCKA", http://www.acronymgeek.com/HCKA (accessed February 16, 2012). |
| CBE/CSE | HCKA [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HCKA. |
| Bluebook | HCKA, http://www.acronymgeek.com/HCKA (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HCKA, http://www.acronymgeek.com/HCKA (optional description here) (as of Feb. 16, 2012, 00:58). |
| AMA | HCKA. Acronym Geek. February 16, 2012, 00:58. Available at: http://www.acronymgeek.com/HCKA. Accessed February 16, 2012, 00:58. |