| APA | E1. (2012, February 9). In Acronym Geek. Retrieved 14:16, February 9, 2012, from http://www.acronymgeek.com/E1 |
| MLA | "E1." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/E1>. |
| MHRA | 'E1', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/E1> [accessed 9 February 2012] |
| Chicago | "E1", http://www.acronymgeek.com/E1 (accessed February 9, 2012). |
| CBE/CSE | E1 [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/E1. |
| Bluebook | E1, http://www.acronymgeek.com/E1 (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, E1, http://www.acronymgeek.com/E1 (optional description here) (as of Feb. 9, 2012, 14:16). |
| AMA | E1. Acronym Geek. February 9, 2012, 14:16. Available at: http://www.acronymgeek.com/E1. Accessed February 9, 2012, 14:16. |