| APA | HHYN. (2012, February 15). In Acronym Geek. Retrieved 04:13, February 15, 2012, from http://www.acronymgeek.com/HHYN |
| MLA | "HHYN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HHYN>. |
| MHRA | 'HHYN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HHYN> [accessed 15 February 2012] |
| Chicago | "HHYN", http://www.acronymgeek.com/HHYN (accessed February 15, 2012). |
| CBE/CSE | HHYN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HHYN. |
| Bluebook | HHYN, http://www.acronymgeek.com/HHYN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHYN, http://www.acronymgeek.com/HHYN (optional description here) (as of Feb. 15, 2012, 04:13). |
| AMA | HHYN. Acronym Geek. February 15, 2012, 04:13. Available at: http://www.acronymgeek.com/HHYN. Accessed February 15, 2012, 04:13. |