| APA | ESTO. (2012, February 11). In Acronym Geek. Retrieved 19:10, February 11, 2012, from http://www.acronymgeek.com/ESTO |
| MLA | "ESTO." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/ESTO>. |
| MHRA | 'ESTO', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/ESTO> [accessed 11 February 2012] |
| Chicago | "ESTO", http://www.acronymgeek.com/ESTO (accessed February 11, 2012). |
| CBE/CSE | ESTO [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/ESTO. |
| Bluebook | ESTO, http://www.acronymgeek.com/ESTO (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ESTO, http://www.acronymgeek.com/ESTO (optional description here) (as of Feb. 11, 2012, 19:10). |
| AMA | ESTO. Acronym Geek. February 11, 2012, 19:10. Available at: http://www.acronymgeek.com/ESTO. Accessed February 11, 2012, 19:10. |