| APA | FOUR. (2012, February 16). In Acronym Geek. Retrieved 15:14, February 16, 2012, from http://www.acronymgeek.com/FOUR |
| MLA | "FOUR." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/FOUR>. |
| MHRA | 'FOUR', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/FOUR> [accessed 16 February 2012] |
| Chicago | "FOUR", http://www.acronymgeek.com/FOUR (accessed February 16, 2012). |
| CBE/CSE | FOUR [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/FOUR. |
| Bluebook | FOUR, http://www.acronymgeek.com/FOUR (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, FOUR, http://www.acronymgeek.com/FOUR (optional description here) (as of Feb. 16, 2012, 15:14). |
| AMA | FOUR. Acronym Geek. February 16, 2012, 15:14. Available at: http://www.acronymgeek.com/FOUR. Accessed February 16, 2012, 15:14. |