| APA | GCBO. (2012, February 16). In Acronym Geek. Retrieved 14:41, February 16, 2012, from http://www.acronymgeek.com/GCBO |
| MLA | "GCBO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/GCBO>. |
| MHRA | 'GCBO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/GCBO> [accessed 16 February 2012] |
| Chicago | "GCBO", http://www.acronymgeek.com/GCBO (accessed February 16, 2012). |
| CBE/CSE | GCBO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/GCBO. |
| Bluebook | GCBO, http://www.acronymgeek.com/GCBO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GCBO, http://www.acronymgeek.com/GCBO (optional description here) (as of Feb. 16, 2012, 14:41). |
| AMA | GCBO. Acronym Geek. February 16, 2012, 14:41. Available at: http://www.acronymgeek.com/GCBO. Accessed February 16, 2012, 14:41. |