| APA | PTBF. (2012, February 14). In Acronym Geek. Retrieved 21:16, February 14, 2012, from http://www.acronymgeek.com/PTBF |
| MLA | "PTBF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PTBF>. |
| MHRA | 'PTBF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PTBF> [accessed 14 February 2012] |
| Chicago | "PTBF", http://www.acronymgeek.com/PTBF (accessed February 14, 2012). |
| CBE/CSE | PTBF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PTBF. |
| Bluebook | PTBF, http://www.acronymgeek.com/PTBF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTBF, http://www.acronymgeek.com/PTBF (optional description here) (as of Feb. 14, 2012, 21:16). |
| AMA | PTBF. Acronym Geek. February 14, 2012, 21:16. Available at: http://www.acronymgeek.com/PTBF. Accessed February 14, 2012, 21:16. |