| APA | ESPA. (2012, February 15). In Acronym Geek. Retrieved 20:39, February 15, 2012, from http://www.acronymgeek.com/ESPA |
| MLA | "ESPA." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/ESPA>. |
| MHRA | 'ESPA', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/ESPA> [accessed 15 February 2012] |
| Chicago | "ESPA", http://www.acronymgeek.com/ESPA (accessed February 15, 2012). |
| CBE/CSE | ESPA [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/ESPA. |
| Bluebook | ESPA, http://www.acronymgeek.com/ESPA (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ESPA, http://www.acronymgeek.com/ESPA (optional description here) (as of Feb. 15, 2012, 20:39). |
| AMA | ESPA. Acronym Geek. February 15, 2012, 20:39. Available at: http://www.acronymgeek.com/ESPA. Accessed February 15, 2012, 20:39. |