| APA | ESO2. (2012, February 16). In Acronym Geek. Retrieved 14:42, February 16, 2012, from http://www.acronymgeek.com/ESO2 |
| MLA | "ESO2." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ESO2>. |
| MHRA | 'ESO2', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ESO2> [accessed 16 February 2012] |
| Chicago | "ESO2", http://www.acronymgeek.com/ESO2 (accessed February 16, 2012). |
| CBE/CSE | ESO2 [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ESO2. |
| Bluebook | ESO2, http://www.acronymgeek.com/ESO2 (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ESO2, http://www.acronymgeek.com/ESO2 (optional description here) (as of Feb. 16, 2012, 14:42). |
| AMA | ESO2. Acronym Geek. February 16, 2012, 14:42. Available at: http://www.acronymgeek.com/ESO2. Accessed February 16, 2012, 14:42. |