| APA | HDYA. (2012, February 14). In Acronym Geek. Retrieved 23:19, February 14, 2012, from http://www.acronymgeek.com/HDYA |
| MLA | "HDYA." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HDYA>. |
| MHRA | 'HDYA', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HDYA> [accessed 14 February 2012] |
| Chicago | "HDYA", http://www.acronymgeek.com/HDYA (accessed February 14, 2012). |
| CBE/CSE | HDYA [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HDYA. |
| Bluebook | HDYA, http://www.acronymgeek.com/HDYA (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDYA, http://www.acronymgeek.com/HDYA (optional description here) (as of Feb. 14, 2012, 23:19). |
| AMA | HDYA. Acronym Geek. February 14, 2012, 23:19. Available at: http://www.acronymgeek.com/HDYA. Accessed February 14, 2012, 23:19. |