| APA | E.T.O.. (2012, February 12). In Acronym Geek. Retrieved 15:29, February 12, 2012, from http://www.acronymgeek.com/E.T.O. |
| MLA | "E.T.O.." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/E.T.O.>. |
| MHRA | 'E.T.O.', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/E.T.O.> [accessed 12 February 2012] |
| Chicago | "E.T.O.", http://www.acronymgeek.com/E.T.O. (accessed February 12, 2012). |
| CBE/CSE | E.T.O. [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/E.T.O.. |
| Bluebook | E.T.O., http://www.acronymgeek.com/E.T.O. (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, E.T.O., http://www.acronymgeek.com/E.T.O. (optional description here) (as of Feb. 12, 2012, 15:29). |
| AMA | E.T.O.. Acronym Geek. February 12, 2012, 15:29. Available at: http://www.acronymgeek.com/E.T.O.. Accessed February 12, 2012, 15:29. |