| APA | FEI. (2012, February 14). In Acronym Geek. Retrieved 10:11, February 14, 2012, from http://www.acronymgeek.com/FEI |
| MLA | "FEI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/FEI>. |
| MHRA | 'FEI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/FEI> [accessed 14 February 2012] |
| Chicago | "FEI", http://www.acronymgeek.com/FEI (accessed February 14, 2012). |
| CBE/CSE | FEI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/FEI. |
| Bluebook | FEI, http://www.acronymgeek.com/FEI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, FEI, http://www.acronymgeek.com/FEI (optional description here) (as of Feb. 14, 2012, 10:11). |
| AMA | FEI. Acronym Geek. February 14, 2012, 10:11. Available at: http://www.acronymgeek.com/FEI. Accessed February 14, 2012, 10:11. |