| APA | HLOS. (2012, February 17). In Acronym Geek. Retrieved 08:14, February 17, 2012, from http://www.acronymgeek.com/HLOS |
| MLA | "HLOS." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/HLOS>. |
| MHRA | 'HLOS', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/HLOS> [accessed 17 February 2012] |
| Chicago | "HLOS", http://www.acronymgeek.com/HLOS (accessed February 17, 2012). |
| CBE/CSE | HLOS [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/HLOS. |
| Bluebook | HLOS, http://www.acronymgeek.com/HLOS (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HLOS, http://www.acronymgeek.com/HLOS (optional description here) (as of Feb. 17, 2012, 08:14). |
| AMA | HLOS. Acronym Geek. February 17, 2012, 08:14. Available at: http://www.acronymgeek.com/HLOS. Accessed February 17, 2012, 08:14. |