| APA | PTBT. (2012, February 11). In Acronym Geek. Retrieved 21:45, February 11, 2012, from http://www.acronymgeek.com/PTBT |
| MLA | "PTBT." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/PTBT>. |
| MHRA | 'PTBT', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/PTBT> [accessed 11 February 2012] |
| Chicago | "PTBT", http://www.acronymgeek.com/PTBT (accessed February 11, 2012). |
| CBE/CSE | PTBT [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/PTBT. |
| Bluebook | PTBT, http://www.acronymgeek.com/PTBT (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTBT, http://www.acronymgeek.com/PTBT (optional description here) (as of Feb. 11, 2012, 21:45). |
| AMA | PTBT. Acronym Geek. February 11, 2012, 21:45. Available at: http://www.acronymgeek.com/PTBT. Accessed February 11, 2012, 21:45. |