| APA | FIRN. (2012, February 15). In Acronym Geek. Retrieved 17:38, February 15, 2012, from http://www.acronymgeek.com/FIRN |
| MLA | "FIRN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/FIRN>. |
| MHRA | 'FIRN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/FIRN> [accessed 15 February 2012] |
| Chicago | "FIRN", http://www.acronymgeek.com/FIRN (accessed February 15, 2012). |
| CBE/CSE | FIRN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/FIRN. |
| Bluebook | FIRN, http://www.acronymgeek.com/FIRN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, FIRN, http://www.acronymgeek.com/FIRN (optional description here) (as of Feb. 15, 2012, 17:38). |
| AMA | FIRN. Acronym Geek. February 15, 2012, 17:38. Available at: http://www.acronymgeek.com/FIRN. Accessed February 15, 2012, 17:38. |