| APA | OEIP. (2012, February 16). In Acronym Geek. Retrieved 05:46, February 16, 2012, from http://www.acronymgeek.com/OEIP |
| MLA | "OEIP." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OEIP>. |
| MHRA | 'OEIP', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OEIP> [accessed 16 February 2012] |
| Chicago | "OEIP", http://www.acronymgeek.com/OEIP (accessed February 16, 2012). |
| CBE/CSE | OEIP [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OEIP. |
| Bluebook | OEIP, http://www.acronymgeek.com/OEIP (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OEIP, http://www.acronymgeek.com/OEIP (optional description here) (as of Feb. 16, 2012, 05:46). |
| AMA | OEIP. Acronym Geek. February 16, 2012, 05:46. Available at: http://www.acronymgeek.com/OEIP. Accessed February 16, 2012, 05:46. |