| APA | SFD. (2012, February 15). In Acronym Geek. Retrieved 03:33, February 15, 2012, from http://www.acronymgeek.com/SFD |
| MLA | "SFD." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/SFD>. |
| MHRA | 'SFD', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/SFD> [accessed 15 February 2012] |
| Chicago | "SFD", http://www.acronymgeek.com/SFD (accessed February 15, 2012). |
| CBE/CSE | SFD [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/SFD. |
| Bluebook | SFD, http://www.acronymgeek.com/SFD (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SFD, http://www.acronymgeek.com/SFD (optional description here) (as of Feb. 15, 2012, 03:33). |
| AMA | SFD. Acronym Geek. February 15, 2012, 03:33. Available at: http://www.acronymgeek.com/SFD. Accessed February 15, 2012, 03:33. |