| APA | ERF. (2012, February 14). In Acronym Geek. Retrieved 11:26, February 14, 2012, from http://www.acronymgeek.com/ERF |
| MLA | "ERF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ERF>. |
| MHRA | 'ERF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ERF> [accessed 14 February 2012] |
| Chicago | "ERF", http://www.acronymgeek.com/ERF (accessed February 14, 2012). |
| CBE/CSE | ERF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ERF. |
| Bluebook | ERF, http://www.acronymgeek.com/ERF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ERF, http://www.acronymgeek.com/ERF (optional description here) (as of Feb. 14, 2012, 11:26). |
| AMA | ERF. Acronym Geek. February 14, 2012, 11:26. Available at: http://www.acronymgeek.com/ERF. Accessed February 14, 2012, 11:26. |