| APA | TTDO. (2012, February 15). In Acronym Geek. Retrieved 18:20, February 15, 2012, from http://www.acronymgeek.com/TTDO |
| MLA | "TTDO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/TTDO>. |
| MHRA | 'TTDO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/TTDO> [accessed 15 February 2012] |
| Chicago | "TTDO", http://www.acronymgeek.com/TTDO (accessed February 15, 2012). |
| CBE/CSE | TTDO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/TTDO. |
| Bluebook | TTDO, http://www.acronymgeek.com/TTDO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, TTDO, http://www.acronymgeek.com/TTDO (optional description here) (as of Feb. 15, 2012, 18:20). |
| AMA | TTDO. Acronym Geek. February 15, 2012, 18:20. Available at: http://www.acronymgeek.com/TTDO. Accessed February 15, 2012, 18:20. |