| APA | HDYL. (2012, February 16). In Acronym Geek. Retrieved 00:27, February 16, 2012, from http://www.acronymgeek.com/HDYL |
| MLA | "HDYL." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HDYL>. |
| MHRA | 'HDYL', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HDYL> [accessed 16 February 2012] |
| Chicago | "HDYL", http://www.acronymgeek.com/HDYL (accessed February 16, 2012). |
| CBE/CSE | HDYL [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HDYL. |
| Bluebook | HDYL, http://www.acronymgeek.com/HDYL (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDYL, http://www.acronymgeek.com/HDYL (optional description here) (as of Feb. 16, 2012, 00:27). |
| AMA | HDYL. Acronym Geek. February 16, 2012, 00:27. Available at: http://www.acronymgeek.com/HDYL. Accessed February 16, 2012, 00:27. |