| Style | Reference Text |
|---|
| APA | 21R-C. (2013, May 22). In All Acronyms. Retrieved 08:28, May 22, 2013, from http://www.all-acronyms.com/21R-C |
| MLA | "21R-C." All Acronyms. 22 May 2013, 08:28. All Acronyms. 22 May 2013 <http://www.all-acronyms.com/21R-C>. |
| MHRA | '21R-C', All Acronyms, 22 May 2013, 08:28, <http://www.all-acronyms.com/21R-C> [accessed 22 May 2013] |
| Chicago | "21R-C," http://www.all-acronyms.com/21R-C (accessed May 22, 2013). |
| CBE/CSE | 21R-C [Internet]. All Acronyms; 2013 May 22, 08:28 [cited 2013 May 22]. Available from: http://www.all-acronyms.com/21R-C. |
| Bluebook | 21R-C, http://www.all-acronyms.com/21R-C (last visited May 22, 2013). |
| Bluebook: Harvard JOLT | See All Acronyms, 21R-C, http://www.all-acronyms.com/21R-C (optional description here) (as of May. 22, 2013, 08:28). |
| AMA | 21R-C. All Acronyms. May 22, 2013, 08:28. Available at: http://www.all-acronyms.com/21R-C. Accessed May 22, 2013. |
21 Denotes Layer Periodicity