| APA | HHEF. (2012, February 14). In Acronym Geek. Retrieved 20:16, February 14, 2012, from http://www.acronymgeek.com/HHEF |
| MLA | "HHEF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HHEF>. |
| MHRA | 'HHEF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HHEF> [accessed 14 February 2012] |
| Chicago | "HHEF", http://www.acronymgeek.com/HHEF (accessed February 14, 2012). |
| CBE/CSE | HHEF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HHEF. |
| Bluebook | HHEF, http://www.acronymgeek.com/HHEF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHEF, http://www.acronymgeek.com/HHEF (optional description here) (as of Feb. 14, 2012, 20:16). |
| AMA | HHEF. Acronym Geek. February 14, 2012, 20:16. Available at: http://www.acronymgeek.com/HHEF. Accessed February 14, 2012, 20:16. |