| APA | 2R. (2012, February 10). In Acronym Geek. Retrieved 10:39, February 10, 2012, from http://www.acronymgeek.com/2R |
| MLA | "2R." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/2R>. |
| MHRA | '2R', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/2R> [accessed 10 February 2012] |
| Chicago | "2R", http://www.acronymgeek.com/2R (accessed February 10, 2012). |
| CBE/CSE | 2R [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/2R. |
| Bluebook | 2R, http://www.acronymgeek.com/2R (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 2R, http://www.acronymgeek.com/2R (optional description here) (as of Feb. 10, 2012, 10:39). |
| AMA | 2R. Acronym Geek. February 10, 2012, 10:39. Available at: http://www.acronymgeek.com/2R. Accessed February 10, 2012, 10:39. |