| APA | TTDI. (2012, February 16). In Acronym Geek. Retrieved 04:59, February 16, 2012, from http://www.acronymgeek.com/TTDI |
| MLA | "TTDI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/TTDI>. |
| MHRA | 'TTDI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/TTDI> [accessed 16 February 2012] |
| Chicago | "TTDI", http://www.acronymgeek.com/TTDI (accessed February 16, 2012). |
| CBE/CSE | TTDI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/TTDI. |
| Bluebook | TTDI, http://www.acronymgeek.com/TTDI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, TTDI, http://www.acronymgeek.com/TTDI (optional description here) (as of Feb. 16, 2012, 04:59). |
| AMA | TTDI. Acronym Geek. February 16, 2012, 04:59. Available at: http://www.acronymgeek.com/TTDI. Accessed February 16, 2012, 04:59. |