| APA | 1S. (2012, February 10). In Acronym Geek. Retrieved 09:39, February 10, 2012, from http://www.acronymgeek.com/1S |
| MLA | "1S." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/1S>. |
| MHRA | '1S', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/1S> [accessed 10 February 2012] |
| Chicago | "1S", http://www.acronymgeek.com/1S (accessed February 10, 2012). |
| CBE/CSE | 1S [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/1S. |
| Bluebook | 1S, http://www.acronymgeek.com/1S (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 1S, http://www.acronymgeek.com/1S (optional description here) (as of Feb. 10, 2012, 09:39). |
| AMA | 1S. Acronym Geek. February 10, 2012, 09:39. Available at: http://www.acronymgeek.com/1S. Accessed February 10, 2012, 09:39. |