| APA | EHAO. (2012, February 16). In Acronym Geek. Retrieved 20:07, February 16, 2012, from http://www.acronymgeek.com/EHAO |
| MLA | "EHAO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/EHAO>. |
| MHRA | 'EHAO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/EHAO> [accessed 16 February 2012] |
| Chicago | "EHAO", http://www.acronymgeek.com/EHAO (accessed February 16, 2012). |
| CBE/CSE | EHAO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/EHAO. |
| Bluebook | EHAO, http://www.acronymgeek.com/EHAO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EHAO, http://www.acronymgeek.com/EHAO (optional description here) (as of Feb. 16, 2012, 20:07). |
| AMA | EHAO. Acronym Geek. February 16, 2012, 20:07. Available at: http://www.acronymgeek.com/EHAO. Accessed February 16, 2012, 20:07. |