| APA | HLAO. (2012, February 15). In Acronym Geek. Retrieved 06:30, February 15, 2012, from http://www.acronymgeek.com/HLAO |
| MLA | "HLAO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HLAO>. |
| MHRA | 'HLAO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HLAO> [accessed 15 February 2012] |
| Chicago | "HLAO", http://www.acronymgeek.com/HLAO (accessed February 15, 2012). |
| CBE/CSE | HLAO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HLAO. |
| Bluebook | HLAO, http://www.acronymgeek.com/HLAO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HLAO, http://www.acronymgeek.com/HLAO (optional description here) (as of Feb. 15, 2012, 06:30). |
| AMA | HLAO. Acronym Geek. February 15, 2012, 06:30. Available at: http://www.acronymgeek.com/HLAO. Accessed February 15, 2012, 06:30. |