| APA | GPB. (2012, February 13). In Acronym Geek. Retrieved 20:53, February 13, 2012, from http://www.acronymgeek.com/GPB |
| MLA | "GPB." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/GPB>. |
| MHRA | 'GPB', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/GPB> [accessed 13 February 2012] |
| Chicago | "GPB", http://www.acronymgeek.com/GPB (accessed February 13, 2012). |
| CBE/CSE | GPB [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/GPB. |
| Bluebook | GPB, http://www.acronymgeek.com/GPB (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPB, http://www.acronymgeek.com/GPB (optional description here) (as of Feb. 13, 2012, 20:53). |
| AMA | GPB. Acronym Geek. February 13, 2012, 20:53. Available at: http://www.acronymgeek.com/GPB. Accessed February 13, 2012, 20:53. |