| APA | EFFCY. (2012, February 9). In Acronym Geek. Retrieved 21:39, February 9, 2012, from http://www.acronymgeek.com/EFFCY |
| MLA | "EFFCY." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/EFFCY>. |
| MHRA | 'EFFCY', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/EFFCY> [accessed 9 February 2012] |
| Chicago | "EFFCY", http://www.acronymgeek.com/EFFCY (accessed February 9, 2012). |
| CBE/CSE | EFFCY [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/EFFCY. |
| Bluebook | EFFCY, http://www.acronymgeek.com/EFFCY (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EFFCY, http://www.acronymgeek.com/EFFCY (optional description here) (as of Feb. 9, 2012, 21:39). |
| AMA | EFFCY. Acronym Geek. February 9, 2012, 21:39. Available at: http://www.acronymgeek.com/EFFCY. Accessed February 9, 2012, 21:39. |