| APA | OSEN. (2012, February 15). In Acronym Geek. Retrieved 05:30, February 15, 2012, from http://www.acronymgeek.com/OSEN |
| MLA | "OSEN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OSEN>. |
| MHRA | 'OSEN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OSEN> [accessed 15 February 2012] |
| Chicago | "OSEN", http://www.acronymgeek.com/OSEN (accessed February 15, 2012). |
| CBE/CSE | OSEN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OSEN. |
| Bluebook | OSEN, http://www.acronymgeek.com/OSEN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OSEN, http://www.acronymgeek.com/OSEN (optional description here) (as of Feb. 15, 2012, 05:30). |
| AMA | OSEN. Acronym Geek. February 15, 2012, 05:30. Available at: http://www.acronymgeek.com/OSEN. Accessed February 15, 2012, 05:30. |