| APA | FKOS. (2012, February 14). In Acronym Geek. Retrieved 18:49, February 14, 2012, from http://www.acronymgeek.com/FKOS |
| MLA | "FKOS." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/FKOS>. |
| MHRA | 'FKOS', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/FKOS> [accessed 14 February 2012] |
| Chicago | "FKOS", http://www.acronymgeek.com/FKOS (accessed February 14, 2012). |
| CBE/CSE | FKOS [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/FKOS. |
| Bluebook | FKOS, http://www.acronymgeek.com/FKOS (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, FKOS, http://www.acronymgeek.com/FKOS (optional description here) (as of Feb. 14, 2012, 18:49). |
| AMA | FKOS. Acronym Geek. February 14, 2012, 18:49. Available at: http://www.acronymgeek.com/FKOS. Accessed February 14, 2012, 18:49. |