| APA | HFEL. (2012, February 14). In Acronym Geek. Retrieved 14:10, February 14, 2012, from http://www.acronymgeek.com/HFEL |
| MLA | "HFEL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HFEL>. |
| MHRA | 'HFEL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HFEL> [accessed 14 February 2012] |
| Chicago | "HFEL", http://www.acronymgeek.com/HFEL (accessed February 14, 2012). |
| CBE/CSE | HFEL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HFEL. |
| Bluebook | HFEL, http://www.acronymgeek.com/HFEL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HFEL, http://www.acronymgeek.com/HFEL (optional description here) (as of Feb. 14, 2012, 14:10). |
| AMA | HFEL. Acronym Geek. February 14, 2012, 14:10. Available at: http://www.acronymgeek.com/HFEL. Accessed February 14, 2012, 14:10. |