| APA | HDWN. (2012, February 15). In Acronym Geek. Retrieved 02:11, February 15, 2012, from http://www.acronymgeek.com/HDWN |
| MLA | "HDWN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HDWN>. |
| MHRA | 'HDWN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HDWN> [accessed 15 February 2012] |
| Chicago | "HDWN", http://www.acronymgeek.com/HDWN (accessed February 15, 2012). |
| CBE/CSE | HDWN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HDWN. |
| Bluebook | HDWN, http://www.acronymgeek.com/HDWN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HDWN, http://www.acronymgeek.com/HDWN (optional description here) (as of Feb. 15, 2012, 02:11). |
| AMA | HDWN. Acronym Geek. February 15, 2012, 02:11. Available at: http://www.acronymgeek.com/HDWN. Accessed February 15, 2012, 02:11. |