| APA | ZEAO. (2012, February 17). In Acronym Geek. Retrieved 02:44, February 17, 2012, from http://www.acronymgeek.com/ZEAO |
| MLA | "ZEAO." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/ZEAO>. |
| MHRA | 'ZEAO', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/ZEAO> [accessed 17 February 2012] |
| Chicago | "ZEAO", http://www.acronymgeek.com/ZEAO (accessed February 17, 2012). |
| CBE/CSE | ZEAO [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/ZEAO. |
| Bluebook | ZEAO, http://www.acronymgeek.com/ZEAO (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZEAO, http://www.acronymgeek.com/ZEAO (optional description here) (as of Feb. 17, 2012, 02:44). |
| AMA | ZEAO. Acronym Geek. February 17, 2012, 02:44. Available at: http://www.acronymgeek.com/ZEAO. Accessed February 17, 2012, 02:44. |