| APA | BTUL. (2012, February 16). In Acronym Geek. Retrieved 23:10, February 16, 2012, from http://www.acronymgeek.com/BTUL |
| MLA | "BTUL." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/BTUL>. |
| MHRA | 'BTUL', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/BTUL> [accessed 16 February 2012] |
| Chicago | "BTUL", http://www.acronymgeek.com/BTUL (accessed February 16, 2012). |
| CBE/CSE | BTUL [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/BTUL. |
| Bluebook | BTUL, http://www.acronymgeek.com/BTUL (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, BTUL, http://www.acronymgeek.com/BTUL (optional description here) (as of Feb. 16, 2012, 23:10). |
| AMA | BTUL. Acronym Geek. February 16, 2012, 23:10. Available at: http://www.acronymgeek.com/BTUL. Accessed February 16, 2012, 23:10. |