| APA | DSYS. (2012, February 11). In Acronym Geek. Retrieved 19:52, February 11, 2012, from http://www.acronymgeek.com/DSYS |
| MLA | "DSYS." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/DSYS>. |
| MHRA | 'DSYS', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/DSYS> [accessed 11 February 2012] |
| Chicago | "DSYS", http://www.acronymgeek.com/DSYS (accessed February 11, 2012). |
| CBE/CSE | DSYS [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/DSYS. |
| Bluebook | DSYS, http://www.acronymgeek.com/DSYS (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DSYS, http://www.acronymgeek.com/DSYS (optional description here) (as of Feb. 11, 2012, 19:52). |
| AMA | DSYS. Acronym Geek. February 11, 2012, 19:52. Available at: http://www.acronymgeek.com/DSYS. Accessed February 11, 2012, 19:52. |