Child-specific:

Committee on the Rights of the Child

• General Comment No. 8 (2006) on “The right of the child to protection from corporal punishment and other cruel or degrading punishment” (English, French, Spanish)

• General Comment No. 6 (2005) on “Treatment of unaccompanied or separated children outside their country of origin” (English, French, Spanish)

• CRC Day of General Discussion on the Administration of Juvenile Justice (1995) (English)

• CRC Day of General Discussion on the Right of the Child to be Heard (2006) (English)

• CRC Day of General Discussion on Children without Parental Care (2005) (English)

• CRC Day of General Discussion on State Violence Against Children (2000) (English)

• CRC Recommendation on the Administration of Juvenile Justice (1999) (English)

• CRC Concluding Observations  on State Reports in relation to juvenile justice
  

UN Study on Violence Against Children

•  Report of the Independent Expert for the United Nations Study on Violence Against Children, Final Report (2006) (English, French, Spanish, multiple languages)

 
Non child-specific:

 
Office of the High Commissioner for Human Rights

• OHCHR Professional Training Series No. 8/Rev.1 "Istanbul Protocol: Manual on the Effective Investigation and Documentation of Torture and Other Cruel, Inhumane or Degrading Treatment or Punishment " (2004) (English, French, Spanish)