| APA | USEI. (2012, February 16). In Acronym Geek. Retrieved 03:37, February 16, 2012, from http://www.acronymgeek.com/USEI |
| MLA | "USEI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/USEI>. |
| MHRA | 'USEI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/USEI> [accessed 16 February 2012] |
| Chicago | "USEI", http://www.acronymgeek.com/USEI (accessed February 16, 2012). |
| CBE/CSE | USEI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/USEI. |
| Bluebook | USEI, http://www.acronymgeek.com/USEI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, USEI, http://www.acronymgeek.com/USEI (optional description here) (as of Feb. 16, 2012, 03:37). |
| AMA | USEI. Acronym Geek. February 16, 2012, 03:37. Available at: http://www.acronymgeek.com/USEI. Accessed February 16, 2012, 03:37. |