| APA | PGBO. (2012, February 17). In Acronym Geek. Retrieved 02:15, February 17, 2012, from http://www.acronymgeek.com/PGBO |
| MLA | "PGBO." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PGBO>. |
| MHRA | 'PGBO', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PGBO> [accessed 17 February 2012] |
| Chicago | "PGBO", http://www.acronymgeek.com/PGBO (accessed February 17, 2012). |
| CBE/CSE | PGBO [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PGBO. |
| Bluebook | PGBO, http://www.acronymgeek.com/PGBO (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PGBO, http://www.acronymgeek.com/PGBO (optional description here) (as of Feb. 17, 2012, 02:15). |
| AMA | PGBO. Acronym Geek. February 17, 2012, 02:15. Available at: http://www.acronymgeek.com/PGBO. Accessed February 17, 2012, 02:15. |