| APA | OB. (2012, February 14). In Acronym Geek. Retrieved 06:12, February 14, 2012, from http://www.acronymgeek.com/OB |
| MLA | "OB." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OB>. |
| MHRA | 'OB', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OB> [accessed 14 February 2012] |
| Chicago | "OB", http://www.acronymgeek.com/OB (accessed February 14, 2012). |
| CBE/CSE | OB [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OB. |
| Bluebook | OB, http://www.acronymgeek.com/OB (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OB, http://www.acronymgeek.com/OB (optional description here) (as of Feb. 14, 2012, 06:12). |
| AMA | OB. Acronym Geek. February 14, 2012, 06:12. Available at: http://www.acronymgeek.com/OB. Accessed February 14, 2012, 06:12. |