| APA | 4YEO. (2012, February 10). In Acronym Geek. Retrieved 09:51, February 10, 2012, from http://www.acronymgeek.com/4YEO |
| MLA | "4YEO." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/4YEO>. |
| MHRA | '4YEO', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/4YEO> [accessed 10 February 2012] |
| Chicago | "4YEO", http://www.acronymgeek.com/4YEO (accessed February 10, 2012). |
| CBE/CSE | 4YEO [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/4YEO. |
| Bluebook | 4YEO, http://www.acronymgeek.com/4YEO (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 4YEO, http://www.acronymgeek.com/4YEO (optional description here) (as of Feb. 10, 2012, 09:51). |
| AMA | 4YEO. Acronym Geek. February 10, 2012, 09:51. Available at: http://www.acronymgeek.com/4YEO. Accessed February 10, 2012, 09:51. |