| APA | SDF. (2012, February 14). In Acronym Geek. Retrieved 19:30, February 14, 2012, from http://www.acronymgeek.com/SDF |
| MLA | "SDF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/SDF>. |
| MHRA | 'SDF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/SDF> [accessed 14 February 2012] |
| Chicago | "SDF", http://www.acronymgeek.com/SDF (accessed February 14, 2012). |
| CBE/CSE | SDF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/SDF. |
| Bluebook | SDF, http://www.acronymgeek.com/SDF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SDF, http://www.acronymgeek.com/SDF (optional description here) (as of Feb. 14, 2012, 19:30). |
| AMA | SDF. Acronym Geek. February 14, 2012, 19:30. Available at: http://www.acronymgeek.com/SDF. Accessed February 14, 2012, 19:30. |