| APA | 9ER. (2012, February 14). In Acronym Geek. Retrieved 07:16, February 14, 2012, from http://www.acronymgeek.com/9ER |
| MLA | "9ER." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/9ER>. |
| MHRA | '9ER', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/9ER> [accessed 14 February 2012] |
| Chicago | "9ER", http://www.acronymgeek.com/9ER (accessed February 14, 2012). |
| CBE/CSE | 9ER [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/9ER. |
| Bluebook | 9ER, http://www.acronymgeek.com/9ER (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 9ER, http://www.acronymgeek.com/9ER (optional description here) (as of Feb. 14, 2012, 07:16). |
| AMA | 9ER. Acronym Geek. February 14, 2012, 07:16. Available at: http://www.acronymgeek.com/9ER. Accessed February 14, 2012, 07:16. |