| APA | 20R. (2012, February 14). In Acronym Geek. Retrieved 07:33, February 14, 2012, from http://www.acronymgeek.com/20R |
| MLA | "20R." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/20R>. |
| MHRA | '20R', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/20R> [accessed 14 February 2012] |
| Chicago | "20R", http://www.acronymgeek.com/20R (accessed February 14, 2012). |
| CBE/CSE | 20R [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/20R. |
| Bluebook | 20R, http://www.acronymgeek.com/20R (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 20R, http://www.acronymgeek.com/20R (optional description here) (as of Feb. 14, 2012, 07:33). |
| AMA | 20R. Acronym Geek. February 14, 2012, 07:33. Available at: http://www.acronymgeek.com/20R. Accessed February 14, 2012, 07:33. |