| APA | ROPN. (2012, February 16). In Acronym Geek. Retrieved 10:03, February 16, 2012, from http://www.acronymgeek.com/ROPN |
| MLA | "ROPN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ROPN>. |
| MHRA | 'ROPN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ROPN> [accessed 16 February 2012] |
| Chicago | "ROPN", http://www.acronymgeek.com/ROPN (accessed February 16, 2012). |
| CBE/CSE | ROPN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ROPN. |
| Bluebook | ROPN, http://www.acronymgeek.com/ROPN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ROPN, http://www.acronymgeek.com/ROPN (optional description here) (as of Feb. 16, 2012, 10:03). |
| AMA | ROPN. Acronym Geek. February 16, 2012, 10:03. Available at: http://www.acronymgeek.com/ROPN. Accessed February 16, 2012, 10:03. |