| APA | ENA. (2012, February 10). In Acronym Geek. Retrieved 08:24, February 10, 2012, from http://www.acronymgeek.com/ENA |
| MLA | "ENA." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/ENA>. |
| MHRA | 'ENA', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/ENA> [accessed 10 February 2012] |
| Chicago | "ENA", http://www.acronymgeek.com/ENA (accessed February 10, 2012). |
| CBE/CSE | ENA [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/ENA. |
| Bluebook | ENA, http://www.acronymgeek.com/ENA (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ENA, http://www.acronymgeek.com/ENA (optional description here) (as of Feb. 10, 2012, 08:24). |
| AMA | ENA. Acronym Geek. February 10, 2012, 08:24. Available at: http://www.acronymgeek.com/ENA. Accessed February 10, 2012, 08:24. |