| APA | SDN. (2012, February 14). In Acronym Geek. Retrieved 19:39, February 14, 2012, from http://www.acronymgeek.com/SDN |
| MLA | "SDN." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/SDN>. |
| MHRA | 'SDN', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/SDN> [accessed 14 February 2012] |
| Chicago | "SDN", http://www.acronymgeek.com/SDN (accessed February 14, 2012). |
| CBE/CSE | SDN [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/SDN. |
| Bluebook | SDN, http://www.acronymgeek.com/SDN (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SDN, http://www.acronymgeek.com/SDN (optional description here) (as of Feb. 14, 2012, 19:39). |
| AMA | SDN. Acronym Geek. February 14, 2012, 19:39. Available at: http://www.acronymgeek.com/SDN. Accessed February 14, 2012, 19:39. |