| APA | PO-211. (2012, February 10). In Acronym Geek. Retrieved 13:44, February 10, 2012, from http://www.acronymgeek.com/PO-211 |
| MLA | "PO-211." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/PO-211>. |
| MHRA | 'PO-211', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/PO-211> [accessed 10 February 2012] |
| Chicago | "PO-211", http://www.acronymgeek.com/PO-211 (accessed February 10, 2012). |
| CBE/CSE | PO-211 [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/PO-211. |
| Bluebook | PO-211, http://www.acronymgeek.com/PO-211 (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PO-211, http://www.acronymgeek.com/PO-211 (optional description here) (as of Feb. 10, 2012, 13:44). |
| AMA | PO-211. Acronym Geek. February 10, 2012, 13:44. Available at: http://www.acronymgeek.com/PO-211. Accessed February 10, 2012, 13:44. |