| APA | EI/CI. (2012, February 11). In Acronym Geek. Retrieved 17:45, February 11, 2012, from http://www.acronymgeek.com/EI/CI |
| MLA | "EI/CI." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/EI/CI>. |
| MHRA | 'EI/CI', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/EI/CI> [accessed 11 February 2012] |
| Chicago | "EI/CI", http://www.acronymgeek.com/EI/CI (accessed February 11, 2012). |
| CBE/CSE | EI/CI [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/EI/CI. |
| Bluebook | EI/CI, http://www.acronymgeek.com/EI/CI (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EI/CI, http://www.acronymgeek.com/EI/CI (optional description here) (as of Feb. 11, 2012, 17:45). |
| AMA | EI/CI. Acronym Geek. February 11, 2012, 17:45. Available at: http://www.acronymgeek.com/EI/CI. Accessed February 11, 2012, 17:45. |