| APA | R2A. (2012, February 14). In Acronym Geek. Retrieved 12:05, February 14, 2012, from http://www.acronymgeek.com/R2A |
| MLA | "R2A." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/R2A>. |
| MHRA | 'R2A', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/R2A> [accessed 14 February 2012] |
| Chicago | "R2A", http://www.acronymgeek.com/R2A (accessed February 14, 2012). |
| CBE/CSE | R2A [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/R2A. |
| Bluebook | R2A, http://www.acronymgeek.com/R2A (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, R2A, http://www.acronymgeek.com/R2A (optional description here) (as of Feb. 14, 2012, 12:05). |
| AMA | R2A. Acronym Geek. February 14, 2012, 12:05. Available at: http://www.acronymgeek.com/R2A. Accessed February 14, 2012, 12:05. |