| APA | RPIO. (2012, February 16). In Acronym Geek. Retrieved 00:52, February 16, 2012, from http://www.acronymgeek.com/RPIO |
| MLA | "RPIO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/RPIO>. |
| MHRA | 'RPIO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/RPIO> [accessed 16 February 2012] |
| Chicago | "RPIO", http://www.acronymgeek.com/RPIO (accessed February 16, 2012). |
| CBE/CSE | RPIO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/RPIO. |
| Bluebook | RPIO, http://www.acronymgeek.com/RPIO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, RPIO, http://www.acronymgeek.com/RPIO (optional description here) (as of Feb. 16, 2012, 00:52). |
| AMA | RPIO. Acronym Geek. February 16, 2012, 00:52. Available at: http://www.acronymgeek.com/RPIO. Accessed February 16, 2012, 00:52. |