| APA | QHO. (2012, February 13). In Acronym Geek. Retrieved 21:09, February 13, 2012, from http://www.acronymgeek.com/QHO |
| MLA | "QHO." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/QHO>. |
| MHRA | 'QHO', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/QHO> [accessed 13 February 2012] |
| Chicago | "QHO", http://www.acronymgeek.com/QHO (accessed February 13, 2012). |
| CBE/CSE | QHO [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/QHO. |
| Bluebook | QHO, http://www.acronymgeek.com/QHO (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, QHO, http://www.acronymgeek.com/QHO (optional description here) (as of Feb. 13, 2012, 21:09). |
| AMA | QHO. Acronym Geek. February 13, 2012, 21:09. Available at: http://www.acronymgeek.com/QHO. Accessed February 13, 2012, 21:09. |