| APA | ER(O-I-PR). (2012, February 12). In Acronym Geek. Retrieved 07:57, February 12, 2012, from http://www.acronymgeek.com/ER(O-I-PR) |
| MLA | "ER(O-I-PR)." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/ER(O-I-PR)>. |
| MHRA | 'ER(O-I-PR)', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/ER(O-I-PR)> [accessed 12 February 2012] |
| Chicago | "ER(O-I-PR)", http://www.acronymgeek.com/ER(O-I-PR) (accessed February 12, 2012). |
| CBE/CSE | ER(O-I-PR) [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/ER(O-I-PR). |
| Bluebook | ER(O-I-PR), http://www.acronymgeek.com/ER(O-I-PR) (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ER(O-I-PR), http://www.acronymgeek.com/ER(O-I-PR) (optional description here) (as of Feb. 12, 2012, 07:57). |
| AMA | ER(O-I-PR). Acronym Geek. February 12, 2012, 07:57. Available at: http://www.acronymgeek.com/ER(O-I-PR). Accessed February 12, 2012, 07:57. |