| APA | HEA. (2012, February 13). In Acronym Geek. Retrieved 21:46, February 13, 2012, from http://www.acronymgeek.com/HEA |
| MLA | "HEA." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/HEA>. |
| MHRA | 'HEA', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/HEA> [accessed 13 February 2012] |
| Chicago | "HEA", http://www.acronymgeek.com/HEA (accessed February 13, 2012). |
| CBE/CSE | HEA [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/HEA. |
| Bluebook | HEA, http://www.acronymgeek.com/HEA (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HEA, http://www.acronymgeek.com/HEA (optional description here) (as of Feb. 13, 2012, 21:46). |
| AMA | HEA. Acronym Geek. February 13, 2012, 21:46. Available at: http://www.acronymgeek.com/HEA. Accessed February 13, 2012, 21:46. |