| APA | HDYH. (2012, February 15). In Acronym Geek. Retrieved 12:58, February 15, 2012, from http://www.acronymgeek.com/HDYH |
| MLA | "HDYH." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HDYH>. |
| MHRA | 'HDYH', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HDYH> [accessed 15 February 2012] |
| Chicago | "HDYH", http://www.acronymgeek.com/HDYH (accessed February 15, 2012). |
| CBE/CSE | HDYH [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HDYH. |
| Bluebook | HDYH, http://www.acronymgeek.com/HDYH (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDYH, http://www.acronymgeek.com/HDYH (optional description here) (as of Feb. 15, 2012, 12:58). |
| AMA | HDYH. Acronym Geek. February 15, 2012, 12:58. Available at: http://www.acronymgeek.com/HDYH. Accessed February 15, 2012, 12:58. |