| APA | HKOL. (2012, February 15). In Acronym Geek. Retrieved 11:48, February 15, 2012, from http://www.acronymgeek.com/HKOL |
| MLA | "HKOL." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HKOL>. |
| MHRA | 'HKOL', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HKOL> [accessed 15 February 2012] |
| Chicago | "HKOL", http://www.acronymgeek.com/HKOL (accessed February 15, 2012). |
| CBE/CSE | HKOL [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HKOL. |
| Bluebook | HKOL, http://www.acronymgeek.com/HKOL (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HKOL, http://www.acronymgeek.com/HKOL (optional description here) (as of Feb. 15, 2012, 11:48). |
| AMA | HKOL. Acronym Geek. February 15, 2012, 11:48. Available at: http://www.acronymgeek.com/HKOL. Accessed February 15, 2012, 11:48. |