| APA | ERPY. (2012, February 16). In Acronym Geek. Retrieved 18:05, February 16, 2012, from http://www.acronymgeek.com/ERPY |
| MLA | "ERPY." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ERPY>. |
| MHRA | 'ERPY', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ERPY> [accessed 16 February 2012] |
| Chicago | "ERPY", http://www.acronymgeek.com/ERPY (accessed February 16, 2012). |
| CBE/CSE | ERPY [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ERPY. |
| Bluebook | ERPY, http://www.acronymgeek.com/ERPY (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ERPY, http://www.acronymgeek.com/ERPY (optional description here) (as of Feb. 16, 2012, 18:05). |
| AMA | ERPY. Acronym Geek. February 16, 2012, 18:05. Available at: http://www.acronymgeek.com/ERPY. Accessed February 16, 2012, 18:05. |