| APA | RIO. (2012, February 9). In Acronym Geek. Retrieved 03:46, February 9, 2012, from http://www.acronymgeek.com/RIO |
| MLA | "RIO." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/RIO>. |
| MHRA | 'RIO', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/RIO> [accessed 9 February 2012] |
| Chicago | "RIO", http://www.acronymgeek.com/RIO (accessed February 9, 2012). |
| CBE/CSE | RIO [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/RIO. |
| Bluebook | RIO, http://www.acronymgeek.com/RIO (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, RIO, http://www.acronymgeek.com/RIO (optional description here) (as of Feb. 9, 2012, 03:46). |
| AMA | RIO. Acronym Geek. February 9, 2012, 03:46. Available at: http://www.acronymgeek.com/RIO. Accessed February 9, 2012, 03:46. |