| APA | ZRPO. (2012, February 14). In Acronym Geek. Retrieved 14:16, February 14, 2012, from http://www.acronymgeek.com/ZRPO |
| MLA | "ZRPO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ZRPO>. |
| MHRA | 'ZRPO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ZRPO> [accessed 14 February 2012] |
| Chicago | "ZRPO", http://www.acronymgeek.com/ZRPO (accessed February 14, 2012). |
| CBE/CSE | ZRPO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ZRPO. |
| Bluebook | ZRPO, http://www.acronymgeek.com/ZRPO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZRPO, http://www.acronymgeek.com/ZRPO (optional description here) (as of Feb. 14, 2012, 14:16). |
| AMA | ZRPO. Acronym Geek. February 14, 2012, 14:16. Available at: http://www.acronymgeek.com/ZRPO. Accessed February 14, 2012, 14:16. |