| APA | OBO. (2012, February 9). In Acronym Geek. Retrieved 20:28, February 9, 2012, from http://www.acronymgeek.com/OBO |
| MLA | "OBO." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/OBO>. |
| MHRA | 'OBO', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/OBO> [accessed 9 February 2012] |
| Chicago | "OBO", http://www.acronymgeek.com/OBO (accessed February 9, 2012). |
| CBE/CSE | OBO [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/OBO. |
| Bluebook | OBO, http://www.acronymgeek.com/OBO (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OBO, http://www.acronymgeek.com/OBO (optional description here) (as of Feb. 9, 2012, 20:28). |
| AMA | OBO. Acronym Geek. February 9, 2012, 20:28. Available at: http://www.acronymgeek.com/OBO. Accessed February 9, 2012, 20:28. |