| APA | HHYS. (2012, February 16). In Acronym Geek. Retrieved 20:43, February 16, 2012, from http://www.acronymgeek.com/HHYS |
| MLA | "HHYS." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HHYS>. |
| MHRA | 'HHYS', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HHYS> [accessed 16 February 2012] |
| Chicago | "HHYS", http://www.acronymgeek.com/HHYS (accessed February 16, 2012). |
| CBE/CSE | HHYS [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HHYS. |
| Bluebook | HHYS, http://www.acronymgeek.com/HHYS (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHYS, http://www.acronymgeek.com/HHYS (optional description here) (as of Feb. 16, 2012, 20:43). |
| AMA | HHYS. Acronym Geek. February 16, 2012, 20:43. Available at: http://www.acronymgeek.com/HHYS. Accessed February 16, 2012, 20:43. |