| APA | R1. (2012, February 14). In Acronym Geek. Retrieved 06:10, February 14, 2012, from http://www.acronymgeek.com/R1 |
| MLA | "R1." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/R1>. |
| MHRA | 'R1', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/R1> [accessed 14 February 2012] |
| Chicago | "R1", http://www.acronymgeek.com/R1 (accessed February 14, 2012). |
| CBE/CSE | R1 [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/R1. |
| Bluebook | R1, http://www.acronymgeek.com/R1 (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, R1, http://www.acronymgeek.com/R1 (optional description here) (as of Feb. 14, 2012, 06:10). |
| AMA | R1. Acronym Geek. February 14, 2012, 06:10. Available at: http://www.acronymgeek.com/R1. Accessed February 14, 2012, 06:10. |