| APA | R2I. (2012, February 14). In Acronym Geek. Retrieved 11:39, February 14, 2012, from http://www.acronymgeek.com/R2I |
| MLA | "R2I." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/R2I>. |
| MHRA | 'R2I', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/R2I> [accessed 14 February 2012] |
| Chicago | "R2I", http://www.acronymgeek.com/R2I (accessed February 14, 2012). |
| CBE/CSE | R2I [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/R2I. |
| Bluebook | R2I, http://www.acronymgeek.com/R2I (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, R2I, http://www.acronymgeek.com/R2I (optional description here) (as of Feb. 14, 2012, 11:39). |
| AMA | R2I. Acronym Geek. February 14, 2012, 11:39. Available at: http://www.acronymgeek.com/R2I. Accessed February 14, 2012, 11:39. |