| APA | ER&I. (2012, February 11). In Acronym Geek. Retrieved 17:39, February 11, 2012, from http://www.acronymgeek.com/ER&I |
| MLA | "ER&I." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/ER&I>. |
| MHRA | 'ER&I', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/ER&I> [accessed 11 February 2012] |
| Chicago | "ER&I", http://www.acronymgeek.com/ER&I (accessed February 11, 2012). |
| CBE/CSE | ER&I [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/ER&I. |
| Bluebook | ER&I, http://www.acronymgeek.com/ER&I (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ER&I, http://www.acronymgeek.com/ER&I (optional description here) (as of Feb. 11, 2012, 17:39). |
| AMA | ER&I. Acronym Geek. February 11, 2012, 17:39. Available at: http://www.acronymgeek.com/ER&I. Accessed February 11, 2012, 17:39. |