| APA | SDY. (2012, February 15). In Acronym Geek. Retrieved 03:15, February 15, 2012, from http://www.acronymgeek.com/SDY |
| MLA | "SDY." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/SDY>. |
| MHRA | 'SDY', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/SDY> [accessed 15 February 2012] |
| Chicago | "SDY", http://www.acronymgeek.com/SDY (accessed February 15, 2012). |
| CBE/CSE | SDY [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/SDY. |
| Bluebook | SDY, http://www.acronymgeek.com/SDY (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SDY, http://www.acronymgeek.com/SDY (optional description here) (as of Feb. 15, 2012, 03:15). |
| AMA | SDY. Acronym Geek. February 15, 2012, 03:15. Available at: http://www.acronymgeek.com/SDY. Accessed February 15, 2012, 03:15. |