| APA | ESPI. (2012, February 15). In Acronym Geek. Retrieved 05:09, February 15, 2012, from http://www.acronymgeek.com/ESPI |
| MLA | "ESPI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/ESPI>. |
| MHRA | 'ESPI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/ESPI> [accessed 15 February 2012] |
| Chicago | "ESPI", http://www.acronymgeek.com/ESPI (accessed February 15, 2012). |
| CBE/CSE | ESPI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/ESPI. |
| Bluebook | ESPI, http://www.acronymgeek.com/ESPI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ESPI, http://www.acronymgeek.com/ESPI (optional description here) (as of Feb. 15, 2012, 05:09). |
| AMA | ESPI. Acronym Geek. February 15, 2012, 05:09. Available at: http://www.acronymgeek.com/ESPI. Accessed February 15, 2012, 05:09. |