| APA | OBGK. (2012, February 15). In Acronym Geek. Retrieved 14:18, February 15, 2012, from http://www.acronymgeek.com/OBGK |
| MLA | "OBGK." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OBGK>. |
| MHRA | 'OBGK', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OBGK> [accessed 15 February 2012] |
| Chicago | "OBGK", http://www.acronymgeek.com/OBGK (accessed February 15, 2012). |
| CBE/CSE | OBGK [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OBGK. |
| Bluebook | OBGK, http://www.acronymgeek.com/OBGK (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OBGK, http://www.acronymgeek.com/OBGK (optional description here) (as of Feb. 15, 2012, 14:18). |
| AMA | OBGK. Acronym Geek. February 15, 2012, 14:18. Available at: http://www.acronymgeek.com/OBGK. Accessed February 15, 2012, 14:18. |