| APA | DDC. (2012, February 13). In Acronym Geek. Retrieved 21:05, February 13, 2012, from http://www.acronymgeek.com/DDC |
| MLA | "DDC." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/DDC>. |
| MHRA | 'DDC', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/DDC> [accessed 13 February 2012] |
| Chicago | "DDC", http://www.acronymgeek.com/DDC (accessed February 13, 2012). |
| CBE/CSE | DDC [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/DDC. |
| Bluebook | DDC, http://www.acronymgeek.com/DDC (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDC, http://www.acronymgeek.com/DDC (optional description here) (as of Feb. 13, 2012, 21:05). |
| AMA | DDC. Acronym Geek. February 13, 2012, 21:05. Available at: http://www.acronymgeek.com/DDC. Accessed February 13, 2012, 21:05. |