The Universal Declaration of Human Rights is the foundation of human rights law. However, local and regional, as well as cultural, traditions of law means that the UDHR is applied very differently across borders and cultures. The sites below help to give an understanding of the basics of and the challenges to applying international human rights laws.
United Nations Office of the High Commissioner for Human Rights: http://www.ohchr.org/en/professionalinterest/pages/internationallaw.aspx
United Nations (General): http://www.un.org/en/documents/udhr/hr_law.shtml
International Human Rights Law Clinic, UC Berkeley: https://www.law.berkeley.edu/ihrlc.htm
Human Rights Institute, Columbia Law School:
Human Rights Law Review: http://hrlr.oxfordjournals.org/