| APA | SC-21. (2012, February 12). In Acronym Geek. Retrieved 12:28, February 12, 2012, from http://www.acronymgeek.com/SC-21 |
| MLA | "SC-21." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/SC-21>. |
| MHRA | 'SC-21', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/SC-21> [accessed 12 February 2012] |
| Chicago | "SC-21", http://www.acronymgeek.com/SC-21 (accessed February 12, 2012). |
| CBE/CSE | SC-21 [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/SC-21. |
| Bluebook | SC-21, http://www.acronymgeek.com/SC-21 (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SC-21, http://www.acronymgeek.com/SC-21 (optional description here) (as of Feb. 12, 2012, 12:28). |
| AMA | SC-21. Acronym Geek. February 12, 2012, 12:28. Available at: http://www.acronymgeek.com/SC-21. Accessed February 12, 2012, 12:28. |