| APA | SDI. (2012, February 14). In Acronym Geek. Retrieved 20:40, February 14, 2012, from http://www.acronymgeek.com/SDI |
| MLA | "SDI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/SDI>. |
| MHRA | 'SDI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/SDI> [accessed 14 February 2012] |
| Chicago | "SDI", http://www.acronymgeek.com/SDI (accessed February 14, 2012). |
| CBE/CSE | SDI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/SDI. |
| Bluebook | SDI, http://www.acronymgeek.com/SDI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SDI, http://www.acronymgeek.com/SDI (optional description here) (as of Feb. 14, 2012, 20:40). |
| AMA | SDI. Acronym Geek. February 14, 2012, 20:40. Available at: http://www.acronymgeek.com/SDI. Accessed February 14, 2012, 20:40. |