| APA | HHEA. (2012, February 15). In Acronym Geek. Retrieved 08:49, February 15, 2012, from http://www.acronymgeek.com/HHEA |
| MLA | "HHEA." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HHEA>. |
| MHRA | 'HHEA', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HHEA> [accessed 15 February 2012] |
| Chicago | "HHEA", http://www.acronymgeek.com/HHEA (accessed February 15, 2012). |
| CBE/CSE | HHEA [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HHEA. |
| Bluebook | HHEA, http://www.acronymgeek.com/HHEA (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHEA, http://www.acronymgeek.com/HHEA (optional description here) (as of Feb. 15, 2012, 08:49). |
| AMA | HHEA. Acronym Geek. February 15, 2012, 08:49. Available at: http://www.acronymgeek.com/HHEA. Accessed February 15, 2012, 08:49. |