| APA | HJO. (2012, February 14). In Acronym Geek. Retrieved 20:36, February 14, 2012, from http://www.acronymgeek.com/HJO |
| MLA | "HJO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HJO>. |
| MHRA | 'HJO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HJO> [accessed 14 February 2012] |
| Chicago | "HJO", http://www.acronymgeek.com/HJO (accessed February 14, 2012). |
| CBE/CSE | HJO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HJO. |
| Bluebook | HJO, http://www.acronymgeek.com/HJO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HJO, http://www.acronymgeek.com/HJO (optional description here) (as of Feb. 14, 2012, 20:36). |
| AMA | HJO. Acronym Geek. February 14, 2012, 20:36. Available at: http://www.acronymgeek.com/HJO. Accessed February 14, 2012, 20:36. |