| APA | GFR. (2012, February 7). In Acronym Geek. Retrieved 22:59, February 7, 2012, from http://www.acronymgeek.com/GFR |
| MLA | "GFR." Acronym Geek. (2012). Acronym Geek. 7 Feb 2012 <http://www.acronymgeek.com/GFR>. |
| MHRA | 'GFR', Acronym Geek, 7 February 2012, <http://www.acronymgeek.com/GFR> [accessed 7 February 2012] |
| Chicago | "GFR", http://www.acronymgeek.com/GFR (accessed February 7, 2012). |
| CBE/CSE | GFR [Internet]. Acronym Geek; 2012 Feb 7 [cited 2012 Feb 7]. Available from: http://www.acronymgeek.com/GFR. |
| Bluebook | GFR, http://www.acronymgeek.com/GFR (last visited February 7, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GFR, http://www.acronymgeek.com/GFR (optional description here) (as of Feb. 7, 2012, 22:59). |
| AMA | GFR. Acronym Geek. February 7, 2012, 22:59. Available at: http://www.acronymgeek.com/GFR. Accessed February 7, 2012, 22:59. |