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