| APA | HFEI. (2012, February 16). In Acronym Geek. Retrieved 12:56, February 16, 2012, from http://www.acronymgeek.com/HFEI |
| MLA | "HFEI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HFEI>. |
| MHRA | 'HFEI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HFEI> [accessed 16 February 2012] |
| Chicago | "HFEI", http://www.acronymgeek.com/HFEI (accessed February 16, 2012). |
| CBE/CSE | HFEI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HFEI. |
| Bluebook | HFEI, http://www.acronymgeek.com/HFEI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HFEI, http://www.acronymgeek.com/HFEI (optional description here) (as of Feb. 16, 2012, 12:56). |
| AMA | HFEI. Acronym Geek. February 16, 2012, 12:56. Available at: http://www.acronymgeek.com/HFEI. Accessed February 16, 2012, 12:56. |