| APA | R-O. (2012, February 13). In Acronym Geek. Retrieved 23:52, February 13, 2012, from http://www.acronymgeek.com/R-O |
| MLA | "R-O." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/R-O>. |
| MHRA | 'R-O', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/R-O> [accessed 13 February 2012] |
| Chicago | "R-O", http://www.acronymgeek.com/R-O (accessed February 13, 2012). |
| CBE/CSE | R-O [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/R-O. |
| Bluebook | R-O, http://www.acronymgeek.com/R-O (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, R-O, http://www.acronymgeek.com/R-O (optional description here) (as of Feb. 13, 2012, 23:52). |
| AMA | R-O. Acronym Geek. February 13, 2012, 23:52. Available at: http://www.acronymgeek.com/R-O. Accessed February 13, 2012, 23:52. |