| APA | ER-. (2012, February 12). In Acronym Geek. Retrieved 06:59, February 12, 2012, from http://www.acronymgeek.com/ER- |
| MLA | "ER-." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/ER->. |
| MHRA | 'ER-', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/ER-> [accessed 12 February 2012] |
| Chicago | "ER-", http://www.acronymgeek.com/ER- (accessed February 12, 2012). |
| CBE/CSE | ER- [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/ER-. |
| Bluebook | ER-, http://www.acronymgeek.com/ER- (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ER-, http://www.acronymgeek.com/ER- (optional description here) (as of Feb. 12, 2012, 06:59). |
| AMA | ER-. Acronym Geek. February 12, 2012, 06:59. Available at: http://www.acronymgeek.com/ER-. Accessed February 12, 2012, 06:59. |