| APA | HDYK. (2012, February 16). In Acronym Geek. Retrieved 22:36, February 16, 2012, from http://www.acronymgeek.com/HDYK |
| MLA | "HDYK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HDYK>. |
| MHRA | 'HDYK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HDYK> [accessed 16 February 2012] |
| Chicago | "HDYK", http://www.acronymgeek.com/HDYK (accessed February 16, 2012). |
| CBE/CSE | HDYK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HDYK. |
| Bluebook | HDYK, http://www.acronymgeek.com/HDYK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDYK, http://www.acronymgeek.com/HDYK (optional description here) (as of Feb. 16, 2012, 22:36). |
| AMA | HDYK. Acronym Geek. February 16, 2012, 22:36. Available at: http://www.acronymgeek.com/HDYK. Accessed February 16, 2012, 22:36. |