| APA | DTMF. (2012, February 17). In Acronym Geek. Retrieved 08:22, February 17, 2012, from http://www.acronymgeek.com/DTMF |
| MLA | "DTMF." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/DTMF>. |
| MHRA | 'DTMF', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/DTMF> [accessed 17 February 2012] |
| Chicago | "DTMF", http://www.acronymgeek.com/DTMF (accessed February 17, 2012). |
| CBE/CSE | DTMF [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/DTMF. |
| Bluebook | DTMF, http://www.acronymgeek.com/DTMF (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DTMF, http://www.acronymgeek.com/DTMF (optional description here) (as of Feb. 17, 2012, 08:22). |
| AMA | DTMF. Acronym Geek. February 17, 2012, 08:22. Available at: http://www.acronymgeek.com/DTMF. Accessed February 17, 2012, 08:22. |