| APA | BIR. (2012, February 9). In Acronym Geek. Retrieved 21:12, February 9, 2012, from http://www.acronymgeek.com/BIR |
| MLA | "BIR." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/BIR>. |
| MHRA | 'BIR', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/BIR> [accessed 9 February 2012] |
| Chicago | "BIR", http://www.acronymgeek.com/BIR (accessed February 9, 2012). |
| CBE/CSE | BIR [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/BIR. |
| Bluebook | BIR, http://www.acronymgeek.com/BIR (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, BIR, http://www.acronymgeek.com/BIR (optional description here) (as of Feb. 9, 2012, 21:12). |
| AMA | BIR. Acronym Geek. February 9, 2012, 21:12. Available at: http://www.acronymgeek.com/BIR. Accessed February 9, 2012, 21:12. |