| APA | PBPO. (2012, February 16). In Acronym Geek. Retrieved 08:51, February 16, 2012, from http://www.acronymgeek.com/PBPO |
| MLA | "PBPO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PBPO>. |
| MHRA | 'PBPO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PBPO> [accessed 16 February 2012] |
| Chicago | "PBPO", http://www.acronymgeek.com/PBPO (accessed February 16, 2012). |
| CBE/CSE | PBPO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PBPO. |
| Bluebook | PBPO, http://www.acronymgeek.com/PBPO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PBPO, http://www.acronymgeek.com/PBPO (optional description here) (as of Feb. 16, 2012, 08:51). |
| AMA | PBPO. Acronym Geek. February 16, 2012, 08:51. Available at: http://www.acronymgeek.com/PBPO. Accessed February 16, 2012, 08:51. |