| APA | SDU. (2012, February 13). In Acronym Geek. Retrieved 22:54, February 13, 2012, from http://www.acronymgeek.com/SDU |
| MLA | "SDU." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/SDU>. |
| MHRA | 'SDU', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/SDU> [accessed 13 February 2012] |
| Chicago | "SDU", http://www.acronymgeek.com/SDU (accessed February 13, 2012). |
| CBE/CSE | SDU [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/SDU. |
| Bluebook | SDU, http://www.acronymgeek.com/SDU (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SDU, http://www.acronymgeek.com/SDU (optional description here) (as of Feb. 13, 2012, 22:54). |
| AMA | SDU. Acronym Geek. February 13, 2012, 22:54. Available at: http://www.acronymgeek.com/SDU. Accessed February 13, 2012, 22:54. |