| APA | 909. (2012, February 10). In Acronym Geek. Retrieved 10:55, February 10, 2012, from http://www.acronymgeek.com/909 |
| MLA | "909." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/909>. |
| MHRA | '909', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/909> [accessed 10 February 2012] |
| Chicago | "909", http://www.acronymgeek.com/909 (accessed February 10, 2012). |
| CBE/CSE | 909 [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/909. |
| Bluebook | 909, http://www.acronymgeek.com/909 (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 909, http://www.acronymgeek.com/909 (optional description here) (as of Feb. 10, 2012, 10:55). |
| AMA | 909. Acronym Geek. February 10, 2012, 10:55. Available at: http://www.acronymgeek.com/909. Accessed February 10, 2012, 10:55. |