| APA | HSYN. (2012, February 15). In Acronym Geek. Retrieved 22:50, February 15, 2012, from http://www.acronymgeek.com/HSYN |
| MLA | "HSYN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HSYN>. |
| MHRA | 'HSYN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HSYN> [accessed 15 February 2012] |
| Chicago | "HSYN", http://www.acronymgeek.com/HSYN (accessed February 15, 2012). |
| CBE/CSE | HSYN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HSYN. |
| Bluebook | HSYN, http://www.acronymgeek.com/HSYN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HSYN, http://www.acronymgeek.com/HSYN (optional description here) (as of Feb. 15, 2012, 22:50). |
| AMA | HSYN. Acronym Geek. February 15, 2012, 22:50. Available at: http://www.acronymgeek.com/HSYN. Accessed February 15, 2012, 22:50. |