| APA | ES-18. (2012, February 11). In Acronym Geek. Retrieved 19:16, February 11, 2012, from http://www.acronymgeek.com/ES-18 |
| MLA | "ES-18." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/ES-18>. |
| MHRA | 'ES-18', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/ES-18> [accessed 11 February 2012] |
| Chicago | "ES-18", http://www.acronymgeek.com/ES-18 (accessed February 11, 2012). |
| CBE/CSE | ES-18 [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/ES-18. |
| Bluebook | ES-18, http://www.acronymgeek.com/ES-18 (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ES-18, http://www.acronymgeek.com/ES-18 (optional description here) (as of Feb. 11, 2012, 19:16). |
| AMA | ES-18. Acronym Geek. February 11, 2012, 19:16. Available at: http://www.acronymgeek.com/ES-18. Accessed February 11, 2012, 19:16. |