| APA | ZDDO. (2012, February 16). In Acronym Geek. Retrieved 11:43, February 16, 2012, from http://www.acronymgeek.com/ZDDO |
| MLA | "ZDDO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ZDDO>. |
| MHRA | 'ZDDO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ZDDO> [accessed 16 February 2012] |
| Chicago | "ZDDO", http://www.acronymgeek.com/ZDDO (accessed February 16, 2012). |
| CBE/CSE | ZDDO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ZDDO. |
| Bluebook | ZDDO, http://www.acronymgeek.com/ZDDO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZDDO, http://www.acronymgeek.com/ZDDO (optional description here) (as of Feb. 16, 2012, 11:43). |
| AMA | ZDDO. Acronym Geek. February 16, 2012, 11:43. Available at: http://www.acronymgeek.com/ZDDO. Accessed February 16, 2012, 11:43. |