| APA | S9. (2012, February 14). In Acronym Geek. Retrieved 06:03, February 14, 2012, from http://www.acronymgeek.com/S9 |
| MLA | "S9." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/S9>. |
| MHRA | 'S9', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/S9> [accessed 14 February 2012] |
| Chicago | "S9", http://www.acronymgeek.com/S9 (accessed February 14, 2012). |
| CBE/CSE | S9 [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/S9. |
| Bluebook | S9, http://www.acronymgeek.com/S9 (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, S9, http://www.acronymgeek.com/S9 (optional description here) (as of Feb. 14, 2012, 06:03). |
| AMA | S9. Acronym Geek. February 14, 2012, 06:03. Available at: http://www.acronymgeek.com/S9. Accessed February 14, 2012, 06:03. |