| APA | EF1. (2012, February 10). In Acronym Geek. Retrieved 09:42, February 10, 2012, from http://www.acronymgeek.com/EF1 |
| MLA | "EF1." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/EF1>. |
| MHRA | 'EF1', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/EF1> [accessed 10 February 2012] |
| Chicago | "EF1", http://www.acronymgeek.com/EF1 (accessed February 10, 2012). |
| CBE/CSE | EF1 [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/EF1. |
| Bluebook | EF1, http://www.acronymgeek.com/EF1 (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EF1, http://www.acronymgeek.com/EF1 (optional description here) (as of Feb. 10, 2012, 09:42). |
| AMA | EF1. Acronym Geek. February 10, 2012, 09:42. Available at: http://www.acronymgeek.com/EF1. Accessed February 10, 2012, 09:42. |