| APA | HSYD. (2012, February 16). In Acronym Geek. Retrieved 22:23, February 16, 2012, from http://www.acronymgeek.com/HSYD |
| MLA | "HSYD." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HSYD>. |
| MHRA | 'HSYD', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HSYD> [accessed 16 February 2012] |
| Chicago | "HSYD", http://www.acronymgeek.com/HSYD (accessed February 16, 2012). |
| CBE/CSE | HSYD [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HSYD. |
| Bluebook | HSYD, http://www.acronymgeek.com/HSYD (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HSYD, http://www.acronymgeek.com/HSYD (optional description here) (as of Feb. 16, 2012, 22:23). |
| AMA | HSYD. Acronym Geek. February 16, 2012, 22:23. Available at: http://www.acronymgeek.com/HSYD. Accessed February 16, 2012, 22:23. |