| APA | PTBS. (2012, February 12). In Acronym Geek. Retrieved 01:52, February 12, 2012, from http://www.acronymgeek.com/PTBS |
| MLA | "PTBS." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/PTBS>. |
| MHRA | 'PTBS', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/PTBS> [accessed 12 February 2012] |
| Chicago | "PTBS", http://www.acronymgeek.com/PTBS (accessed February 12, 2012). |
| CBE/CSE | PTBS [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/PTBS. |
| Bluebook | PTBS, http://www.acronymgeek.com/PTBS (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTBS, http://www.acronymgeek.com/PTBS (optional description here) (as of Feb. 12, 2012, 01:52). |
| AMA | PTBS. Acronym Geek. February 12, 2012, 01:52. Available at: http://www.acronymgeek.com/PTBS. Accessed February 12, 2012, 01:52. |