| APA | ERA. (2012, February 4). In Acronym Geek. Retrieved 11:27, February 4, 2012, from http://www.acronymgeek.com/ERA |
| MLA | "ERA." Acronym Geek. (2012). Acronym Geek. 4 Feb 2012 <http://www.acronymgeek.com/ERA>. |
| MHRA | 'ERA', Acronym Geek, 4 February 2012, <http://www.acronymgeek.com/ERA> [accessed 4 February 2012] |
| Chicago | "ERA", http://www.acronymgeek.com/ERA (accessed February 4, 2012). |
| CBE/CSE | ERA [Internet]. Acronym Geek; 2012 Feb 4 [cited 2012 Feb 4]. Available from: http://www.acronymgeek.com/ERA. |
| Bluebook | ERA, http://www.acronymgeek.com/ERA (last visited February 4, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ERA, http://www.acronymgeek.com/ERA (optional description here) (as of Feb. 4, 2012, 11:27). |
| AMA | ERA. Acronym Geek. February 4, 2012, 11:27. Available at: http://www.acronymgeek.com/ERA. Accessed February 4, 2012, 11:27. |