| APA | E4E. (2012, February 14). In Acronym Geek. Retrieved 20:29, February 14, 2012, from http://www.acronymgeek.com/E4E |
| MLA | "E4E." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/E4E>. |
| MHRA | 'E4E', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/E4E> [accessed 14 February 2012] |
| Chicago | "E4E", http://www.acronymgeek.com/E4E (accessed February 14, 2012). |
| CBE/CSE | E4E [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/E4E. |
| Bluebook | E4E, http://www.acronymgeek.com/E4E (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, E4E, http://www.acronymgeek.com/E4E (optional description here) (as of Feb. 14, 2012, 20:29). |
| AMA | E4E. Acronym Geek. February 14, 2012, 20:29. Available at: http://www.acronymgeek.com/E4E. Accessed February 14, 2012, 20:29. |