| APA | E2. (2012, February 14). In Acronym Geek. Retrieved 06:04, February 14, 2012, from http://www.acronymgeek.com/E2 |
| MLA | "E2." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/E2>. |
| MHRA | 'E2', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/E2> [accessed 14 February 2012] |
| Chicago | "E2", http://www.acronymgeek.com/E2 (accessed February 14, 2012). |
| CBE/CSE | E2 [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/E2. |
| Bluebook | E2, http://www.acronymgeek.com/E2 (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, E2, http://www.acronymgeek.com/E2 (optional description here) (as of Feb. 14, 2012, 06:04). |
| AMA | E2. Acronym Geek. February 14, 2012, 06:04. Available at: http://www.acronymgeek.com/E2. Accessed February 14, 2012, 06:04. |