| APA | ETA. (2012, February 4). In Acronym Geek. Retrieved 11:59, February 4, 2012, from http://www.acronymgeek.com/ETA |
| MLA | "ETA." Acronym Geek. (2012). Acronym Geek. 4 Feb 2012 <http://www.acronymgeek.com/ETA>. |
| MHRA | 'ETA', Acronym Geek, 4 February 2012, <http://www.acronymgeek.com/ETA> [accessed 4 February 2012] |
| Chicago | "ETA", http://www.acronymgeek.com/ETA (accessed February 4, 2012). |
| CBE/CSE | ETA [Internet]. Acronym Geek; 2012 Feb 4 [cited 2012 Feb 4]. Available from: http://www.acronymgeek.com/ETA. |
| Bluebook | ETA, http://www.acronymgeek.com/ETA (last visited February 4, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ETA, http://www.acronymgeek.com/ETA (optional description here) (as of Feb. 4, 2012, 11:59). |
| AMA | ETA. Acronym Geek. February 4, 2012, 11:59. Available at: http://www.acronymgeek.com/ETA. Accessed February 4, 2012, 11:59. |