| APA | ERX. (2012, February 11). In Acronym Geek. Retrieved 22:36, February 11, 2012, from http://www.acronymgeek.com/ERX |
| MLA | "ERX." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/ERX>. |
| MHRA | 'ERX', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/ERX> [accessed 11 February 2012] |
| Chicago | "ERX", http://www.acronymgeek.com/ERX (accessed February 11, 2012). |
| CBE/CSE | ERX [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/ERX. |
| Bluebook | ERX, http://www.acronymgeek.com/ERX (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ERX, http://www.acronymgeek.com/ERX (optional description here) (as of Feb. 11, 2012, 22:36). |
| AMA | ERX. Acronym Geek. February 11, 2012, 22:36. Available at: http://www.acronymgeek.com/ERX. Accessed February 11, 2012, 22:36. |