| APA | PBX. (2012, February 9). In Acronym Geek. Retrieved 00:07, February 9, 2012, from http://www.acronymgeek.com/PBX |
| MLA | "PBX." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/PBX>. |
| MHRA | 'PBX', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/PBX> [accessed 9 February 2012] |
| Chicago | "PBX", http://www.acronymgeek.com/PBX (accessed February 9, 2012). |
| CBE/CSE | PBX [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/PBX. |
| Bluebook | PBX, http://www.acronymgeek.com/PBX (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PBX, http://www.acronymgeek.com/PBX (optional description here) (as of Feb. 9, 2012, 00:07). |
| AMA | PBX. Acronym Geek. February 9, 2012, 00:07. Available at: http://www.acronymgeek.com/PBX. Accessed February 9, 2012, 00:07. |