| APA | ROP. (2012, February 14). In Acronym Geek. Retrieved 04:25, February 14, 2012, from http://www.acronymgeek.com/ROP |
| MLA | "ROP." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ROP>. |
| MHRA | 'ROP', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ROP> [accessed 14 February 2012] |
| Chicago | "ROP", http://www.acronymgeek.com/ROP (accessed February 14, 2012). |
| CBE/CSE | ROP [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ROP. |
| Bluebook | ROP, http://www.acronymgeek.com/ROP (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ROP, http://www.acronymgeek.com/ROP (optional description here) (as of Feb. 14, 2012, 04:25). |
| AMA | ROP. Acronym Geek. February 14, 2012, 04:25. Available at: http://www.acronymgeek.com/ROP. Accessed February 14, 2012, 04:25. |