| APA | HHEU. (2012, February 16). In Acronym Geek. Retrieved 20:18, February 16, 2012, from http://www.acronymgeek.com/HHEU |
| MLA | "HHEU." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HHEU>. |
| MHRA | 'HHEU', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HHEU> [accessed 16 February 2012] |
| Chicago | "HHEU", http://www.acronymgeek.com/HHEU (accessed February 16, 2012). |
| CBE/CSE | HHEU [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HHEU. |
| Bluebook | HHEU, http://www.acronymgeek.com/HHEU (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHEU, http://www.acronymgeek.com/HHEU (optional description here) (as of Feb. 16, 2012, 20:18). |
| AMA | HHEU. Acronym Geek. February 16, 2012, 20:18. Available at: http://www.acronymgeek.com/HHEU. Accessed February 16, 2012, 20:18. |