| APA | 20. (2012, February 14). In Acronym Geek. Retrieved 06:52, February 14, 2012, from http://www.acronymgeek.com/20 |
| MLA | "20." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/20>. |
| MHRA | '20', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/20> [accessed 14 February 2012] |
| Chicago | "20", http://www.acronymgeek.com/20 (accessed February 14, 2012). |
| CBE/CSE | 20 [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/20. |
| Bluebook | 20, http://www.acronymgeek.com/20 (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 20, http://www.acronymgeek.com/20 (optional description here) (as of Feb. 14, 2012, 06:52). |
| AMA | 20. Acronym Geek. February 14, 2012, 06:52. Available at: http://www.acronymgeek.com/20. Accessed February 14, 2012, 06:52. |