| APA | ESPK. (2012, February 16). In Acronym Geek. Retrieved 08:45, February 16, 2012, from http://www.acronymgeek.com/ESPK |
| MLA | "ESPK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ESPK>. |
| MHRA | 'ESPK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ESPK> [accessed 16 February 2012] |
| Chicago | "ESPK", http://www.acronymgeek.com/ESPK (accessed February 16, 2012). |
| CBE/CSE | ESPK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ESPK. |
| Bluebook | ESPK, http://www.acronymgeek.com/ESPK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ESPK, http://www.acronymgeek.com/ESPK (optional description here) (as of Feb. 16, 2012, 08:45). |
| AMA | ESPK. Acronym Geek. February 16, 2012, 08:45. Available at: http://www.acronymgeek.com/ESPK. Accessed February 16, 2012, 08:45. |