| APA | FO. (2012, February 9). In Acronym Geek. Retrieved 16:08, February 9, 2012, from http://www.acronymgeek.com/FO |
| MLA | "FO." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/FO>. |
| MHRA | 'FO', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/FO> [accessed 9 February 2012] |
| Chicago | "FO", http://www.acronymgeek.com/FO (accessed February 9, 2012). |
| CBE/CSE | FO [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/FO. |
| Bluebook | FO, http://www.acronymgeek.com/FO (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, FO, http://www.acronymgeek.com/FO (optional description here) (as of Feb. 9, 2012, 16:08). |
| AMA | FO. Acronym Geek. February 9, 2012, 16:08. Available at: http://www.acronymgeek.com/FO. Accessed February 9, 2012, 16:08. |