| APA | TTD. (2012, February 9). In Acronym Geek. Retrieved 20:41, February 9, 2012, from http://www.acronymgeek.com/TTD |
| MLA | "TTD." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/TTD>. |
| MHRA | 'TTD', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/TTD> [accessed 9 February 2012] |
| Chicago | "TTD", http://www.acronymgeek.com/TTD (accessed February 9, 2012). |
| CBE/CSE | TTD [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/TTD. |
| Bluebook | TTD, http://www.acronymgeek.com/TTD (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, TTD, http://www.acronymgeek.com/TTD (optional description here) (as of Feb. 9, 2012, 20:41). |
| AMA | TTD. Acronym Geek. February 9, 2012, 20:41. Available at: http://www.acronymgeek.com/TTD. Accessed February 9, 2012, 20:41. |