| APA | RE4. (2012, February 11). In Acronym Geek. Retrieved 22:23, February 11, 2012, from http://www.acronymgeek.com/RE4 |
| MLA | "RE4." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/RE4>. |
| MHRA | 'RE4', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/RE4> [accessed 11 February 2012] |
| Chicago | "RE4", http://www.acronymgeek.com/RE4 (accessed February 11, 2012). |
| CBE/CSE | RE4 [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/RE4. |
| Bluebook | RE4, http://www.acronymgeek.com/RE4 (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, RE4, http://www.acronymgeek.com/RE4 (optional description here) (as of Feb. 11, 2012, 22:23). |
| AMA | RE4. Acronym Geek. February 11, 2012, 22:23. Available at: http://www.acronymgeek.com/RE4. Accessed February 11, 2012, 22:23. |