| APA | S1. (2012, February 11). In Acronym Geek. Retrieved 21:49, February 11, 2012, from http://www.acronymgeek.com/S1 |
| MLA | "S1." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/S1>. |
| MHRA | 'S1', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/S1> [accessed 11 February 2012] |
| Chicago | "S1", http://www.acronymgeek.com/S1 (accessed February 11, 2012). |
| CBE/CSE | S1 [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/S1. |
| Bluebook | S1, http://www.acronymgeek.com/S1 (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, S1, http://www.acronymgeek.com/S1 (optional description here) (as of Feb. 11, 2012, 21:49). |
| AMA | S1. Acronym Geek. February 11, 2012, 21:49. Available at: http://www.acronymgeek.com/S1. Accessed February 11, 2012, 21:49. |