| APA | E9. (2012, February 11). In Acronym Geek. Retrieved 20:43, February 11, 2012, from http://www.acronymgeek.com/E9 |
| MLA | "E9." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/E9>. |
| MHRA | 'E9', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/E9> [accessed 11 February 2012] |
| Chicago | "E9", http://www.acronymgeek.com/E9 (accessed February 11, 2012). |
| CBE/CSE | E9 [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/E9. |
| Bluebook | E9, http://www.acronymgeek.com/E9 (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, E9, http://www.acronymgeek.com/E9 (optional description here) (as of Feb. 11, 2012, 20:43). |
| AMA | E9. Acronym Geek. February 11, 2012, 20:43. Available at: http://www.acronymgeek.com/E9. Accessed February 11, 2012, 20:43. |