| APA | ESOK. (2012, February 16). In Acronym Geek. Retrieved 03:23, February 16, 2012, from http://www.acronymgeek.com/ESOK |
| MLA | "ESOK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ESOK>. |
| MHRA | 'ESOK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ESOK> [accessed 16 February 2012] |
| Chicago | "ESOK", http://www.acronymgeek.com/ESOK (accessed February 16, 2012). |
| CBE/CSE | ESOK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ESOK. |
| Bluebook | ESOK, http://www.acronymgeek.com/ESOK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ESOK, http://www.acronymgeek.com/ESOK (optional description here) (as of Feb. 16, 2012, 03:23). |
| AMA | ESOK. Acronym Geek. February 16, 2012, 03:23. Available at: http://www.acronymgeek.com/ESOK. Accessed February 16, 2012, 03:23. |