| APA | HA. (2012, February 14). In Acronym Geek. Retrieved 12:19, February 14, 2012, from http://www.acronymgeek.com/HA/2 |
| MLA | "HA." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HA/2>. |
| MHRA | 'HA', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HA/2> [accessed 14 February 2012] |
| Chicago | "HA", http://www.acronymgeek.com/HA/2 (accessed February 14, 2012). |
| CBE/CSE | HA [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HA/2. |
| Bluebook | HA, http://www.acronymgeek.com/HA/2 (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HA, http://www.acronymgeek.com/HA/2 (optional description here) (as of Feb. 14, 2012, 12:19). |
| AMA | HA. Acronym Geek. February 14, 2012, 12:19. Available at: http://www.acronymgeek.com/HA/2. Accessed February 14, 2012, 12:19. |