| APA | TTDN. (2012, February 16). In Acronym Geek. Retrieved 02:27, February 16, 2012, from http://www.acronymgeek.com/TTDN |
| MLA | "TTDN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/TTDN>. |
| MHRA | 'TTDN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/TTDN> [accessed 16 February 2012] |
| Chicago | "TTDN", http://www.acronymgeek.com/TTDN (accessed February 16, 2012). |
| CBE/CSE | TTDN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/TTDN. |
| Bluebook | TTDN, http://www.acronymgeek.com/TTDN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, TTDN, http://www.acronymgeek.com/TTDN (optional description here) (as of Feb. 16, 2012, 02:27). |
| AMA | TTDN. Acronym Geek. February 16, 2012, 02:27. Available at: http://www.acronymgeek.com/TTDN. Accessed February 16, 2012, 02:27. |