| APA | ETPN. (2012, February 16). In Acronym Geek. Retrieved 06:56, February 16, 2012, from http://www.acronymgeek.com/ETPN |
| MLA | "ETPN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ETPN>. |
| MHRA | 'ETPN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ETPN> [accessed 16 February 2012] |
| Chicago | "ETPN", http://www.acronymgeek.com/ETPN (accessed February 16, 2012). |
| CBE/CSE | ETPN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ETPN. |
| Bluebook | ETPN, http://www.acronymgeek.com/ETPN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ETPN, http://www.acronymgeek.com/ETPN (optional description here) (as of Feb. 16, 2012, 06:56). |
| AMA | ETPN. Acronym Geek. February 16, 2012, 06:56. Available at: http://www.acronymgeek.com/ETPN. Accessed February 16, 2012, 06:56. |