| APA | BTL. (2012, February 14). In Acronym Geek. Retrieved 19:13, February 14, 2012, from http://www.acronymgeek.com/BTL |
| MLA | "BTL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/BTL>. |
| MHRA | 'BTL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/BTL> [accessed 14 February 2012] |
| Chicago | "BTL", http://www.acronymgeek.com/BTL (accessed February 14, 2012). |
| CBE/CSE | BTL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/BTL. |
| Bluebook | BTL, http://www.acronymgeek.com/BTL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, BTL, http://www.acronymgeek.com/BTL (optional description here) (as of Feb. 14, 2012, 19:13). |
| AMA | BTL. Acronym Geek. February 14, 2012, 19:13. Available at: http://www.acronymgeek.com/BTL. Accessed February 14, 2012, 19:13. |