| APA | HDQ. (2012, February 14). In Acronym Geek. Retrieved 04:45, February 14, 2012, from http://www.acronymgeek.com/HDQ |
| MLA | "HDQ." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HDQ>. |
| MHRA | 'HDQ', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HDQ> [accessed 14 February 2012] |
| Chicago | "HDQ", http://www.acronymgeek.com/HDQ (accessed February 14, 2012). |
| CBE/CSE | HDQ [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HDQ. |
| Bluebook | HDQ, http://www.acronymgeek.com/HDQ (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDQ, http://www.acronymgeek.com/HDQ (optional description here) (as of Feb. 14, 2012, 04:45). |
| AMA | HDQ. Acronym Geek. February 14, 2012, 04:45. Available at: http://www.acronymgeek.com/HDQ. Accessed February 14, 2012, 04:45. |