| APA | HLEI. (2012, February 17). In Acronym Geek. Retrieved 00:14, February 17, 2012, from http://www.acronymgeek.com/HLEI |
| MLA | "HLEI." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/HLEI>. |
| MHRA | 'HLEI', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/HLEI> [accessed 17 February 2012] |
| Chicago | "HLEI", http://www.acronymgeek.com/HLEI (accessed February 17, 2012). |
| CBE/CSE | HLEI [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/HLEI. |
| Bluebook | HLEI, http://www.acronymgeek.com/HLEI (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HLEI, http://www.acronymgeek.com/HLEI (optional description here) (as of Feb. 17, 2012, 00:14). |
| AMA | HLEI. Acronym Geek. February 17, 2012, 00:14. Available at: http://www.acronymgeek.com/HLEI. Accessed February 17, 2012, 00:14. |