| APA | EPTO. (2012, February 16). In Acronym Geek. Retrieved 22:29, February 16, 2012, from http://www.acronymgeek.com/EPTO |
| MLA | "EPTO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/EPTO>. |
| MHRA | 'EPTO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/EPTO> [accessed 16 February 2012] |
| Chicago | "EPTO", http://www.acronymgeek.com/EPTO (accessed February 16, 2012). |
| CBE/CSE | EPTO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/EPTO. |
| Bluebook | EPTO, http://www.acronymgeek.com/EPTO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EPTO, http://www.acronymgeek.com/EPTO (optional description here) (as of Feb. 16, 2012, 22:29). |
| AMA | EPTO. Acronym Geek. February 16, 2012, 22:29. Available at: http://www.acronymgeek.com/EPTO. Accessed February 16, 2012, 22:29. |