| APA | HHFE. (2012, February 11). In Acronym Geek. Retrieved 23:38, February 11, 2012, from http://www.acronymgeek.com/HHFE |
| MLA | "HHFE." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/HHFE>. |
| MHRA | 'HHFE', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/HHFE> [accessed 11 February 2012] |
| Chicago | "HHFE", http://www.acronymgeek.com/HHFE (accessed February 11, 2012). |
| CBE/CSE | HHFE [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/HHFE. |
| Bluebook | HHFE, http://www.acronymgeek.com/HHFE (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHFE, http://www.acronymgeek.com/HHFE (optional description here) (as of Feb. 11, 2012, 23:38). |
| AMA | HHFE. Acronym Geek. February 11, 2012, 23:38. Available at: http://www.acronymgeek.com/HHFE. Accessed February 11, 2012, 23:38. |