| APA | BTK. (2012, February 13). In Acronym Geek. Retrieved 23:50, February 13, 2012, from http://www.acronymgeek.com/BTK |
| MLA | "BTK." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/BTK>. |
| MHRA | 'BTK', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/BTK> [accessed 13 February 2012] |
| Chicago | "BTK", http://www.acronymgeek.com/BTK (accessed February 13, 2012). |
| CBE/CSE | BTK [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/BTK. |
| Bluebook | BTK, http://www.acronymgeek.com/BTK (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, BTK, http://www.acronymgeek.com/BTK (optional description here) (as of Feb. 13, 2012, 23:50). |
| AMA | BTK. Acronym Geek. February 13, 2012, 23:50. Available at: http://www.acronymgeek.com/BTK. Accessed February 13, 2012, 23:50. |