| APA | GFEO. (2012, February 16). In Acronym Geek. Retrieved 01:13, February 16, 2012, from http://www.acronymgeek.com/GFEO |
| MLA | "GFEO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/GFEO>. |
| MHRA | 'GFEO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/GFEO> [accessed 16 February 2012] |
| Chicago | "GFEO", http://www.acronymgeek.com/GFEO (accessed February 16, 2012). |
| CBE/CSE | GFEO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/GFEO. |
| Bluebook | GFEO, http://www.acronymgeek.com/GFEO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GFEO, http://www.acronymgeek.com/GFEO (optional description here) (as of Feb. 16, 2012, 01:13). |
| AMA | GFEO. Acronym Geek. February 16, 2012, 01:13. Available at: http://www.acronymgeek.com/GFEO. Accessed February 16, 2012, 01:13. |