| UN R27: Revision 2 (2014) |
| Revision 2 | Amendment 1 (2017) |
| Revision 2 | Amendment 2 (2019) |
| UN R27: Revision 1 (1998) |
| UN R27: Revision 1-Corrigendum 1 (2010) |
| UN R27: Revision 1-Corrigendum 2 (2010) |
| UN R27: Revision 1-Amendment 1 (2010) |
| Earlier texts may be available through the UN Official Document System. |