| APA | HY. (2012, February 14). In Acronym Geek. Retrieved 06:49, February 14, 2012, from http://www.acronymgeek.com/HY |
| MLA | "HY." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HY>. |
| MHRA | 'HY', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HY> [accessed 14 February 2012] |
| Chicago | "HY", http://www.acronymgeek.com/HY (accessed February 14, 2012). |
| CBE/CSE | HY [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HY. |
| Bluebook | HY, http://www.acronymgeek.com/HY (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HY, http://www.acronymgeek.com/HY (optional description here) (as of Feb. 14, 2012, 06:49). |
| AMA | HY. Acronym Geek. February 14, 2012, 06:49. Available at: http://www.acronymgeek.com/HY. Accessed February 14, 2012, 06:49. |