| APA | TTOO. (2012, February 12). In Acronym Geek. Retrieved 12:51, February 12, 2012, from http://www.acronymgeek.com/TTOO |
| MLA | "TTOO." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/TTOO>. |
| MHRA | 'TTOO', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/TTOO> [accessed 12 February 2012] |
| Chicago | "TTOO", http://www.acronymgeek.com/TTOO (accessed February 12, 2012). |
| CBE/CSE | TTOO [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/TTOO. |
| Bluebook | TTOO, http://www.acronymgeek.com/TTOO (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, TTOO, http://www.acronymgeek.com/TTOO (optional description here) (as of Feb. 12, 2012, 12:51). |
| AMA | TTOO. Acronym Geek. February 12, 2012, 12:51. Available at: http://www.acronymgeek.com/TTOO. Accessed February 12, 2012, 12:51. |