| APA | HARD. (2012, February 15). In Acronym Geek. Retrieved 16:21, February 15, 2012, from http://www.acronymgeek.com/HARD |
| MLA | "HARD." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HARD>. |
| MHRA | 'HARD', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HARD> [accessed 15 February 2012] |
| Chicago | "HARD", http://www.acronymgeek.com/HARD (accessed February 15, 2012). |
| CBE/CSE | HARD [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HARD. |
| Bluebook | HARD, http://www.acronymgeek.com/HARD (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HARD, http://www.acronymgeek.com/HARD (optional description here) (as of Feb. 15, 2012, 16:21). |
| AMA | HARD. Acronym Geek. February 15, 2012, 16:21. Available at: http://www.acronymgeek.com/HARD. Accessed February 15, 2012, 16:21. |