| APA | FO4. (2012, February 13). In Acronym Geek. Retrieved 21:18, February 13, 2012, from http://www.acronymgeek.com/FO4 |
| MLA | "FO4." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/FO4>. |
| MHRA | 'FO4', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/FO4> [accessed 13 February 2012] |
| Chicago | "FO4", http://www.acronymgeek.com/FO4 (accessed February 13, 2012). |
| CBE/CSE | FO4 [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/FO4. |
| Bluebook | FO4, http://www.acronymgeek.com/FO4 (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, FO4, http://www.acronymgeek.com/FO4 (optional description here) (as of Feb. 13, 2012, 21:18). |
| AMA | FO4. Acronym Geek. February 13, 2012, 21:18. Available at: http://www.acronymgeek.com/FO4. Accessed February 13, 2012, 21:18. |