| APA | S4A. (2012, February 14). In Acronym Geek. Retrieved 11:19, February 14, 2012, from http://www.acronymgeek.com/S4A |
| MLA | "S4A." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/S4A>. |
| MHRA | 'S4A', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/S4A> [accessed 14 February 2012] |
| Chicago | "S4A", http://www.acronymgeek.com/S4A (accessed February 14, 2012). |
| CBE/CSE | S4A [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/S4A. |
| Bluebook | S4A, http://www.acronymgeek.com/S4A (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, S4A, http://www.acronymgeek.com/S4A (optional description here) (as of Feb. 14, 2012, 11:19). |
| AMA | S4A. Acronym Geek. February 14, 2012, 11:19. Available at: http://www.acronymgeek.com/S4A. Accessed February 14, 2012, 11:19. |