| APA | SDDN. (2012, February 16). In Acronym Geek. Retrieved 01:25, February 16, 2012, from http://www.acronymgeek.com/SDDN |
| MLA | "SDDN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/SDDN>. |
| MHRA | 'SDDN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/SDDN> [accessed 16 February 2012] |
| Chicago | "SDDN", http://www.acronymgeek.com/SDDN (accessed February 16, 2012). |
| CBE/CSE | SDDN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/SDDN. |
| Bluebook | SDDN, http://www.acronymgeek.com/SDDN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SDDN, http://www.acronymgeek.com/SDDN (optional description here) (as of Feb. 16, 2012, 01:25). |
| AMA | SDDN. Acronym Geek. February 16, 2012, 01:25. Available at: http://www.acronymgeek.com/SDDN. Accessed February 16, 2012, 01:25. |