| APA | SOPS. (2012, February 11). In Acronym Geek. Retrieved 06:56, February 11, 2012, from http://www.acronymgeek.com/SOPS |
| MLA | "SOPS." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/SOPS>. |
| MHRA | 'SOPS', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/SOPS> [accessed 11 February 2012] |
| Chicago | "SOPS", http://www.acronymgeek.com/SOPS (accessed February 11, 2012). |
| CBE/CSE | SOPS [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/SOPS. |
| Bluebook | SOPS, http://www.acronymgeek.com/SOPS (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SOPS, http://www.acronymgeek.com/SOPS (optional description here) (as of Feb. 11, 2012, 06:56). |
| AMA | SOPS. Acronym Geek. February 11, 2012, 06:56. Available at: http://www.acronymgeek.com/SOPS. Accessed February 11, 2012, 06:56. |