Refugee law encompasses both customary law, peremptory norms, and international legal instruments.
The only international instruments directly applying to refugees are the 1951 United Nations Convention Relating to the Status of Refugees and the 1967 Protocol Relating to the Status of Refugees. Bot...h the Convention and the Protocol are open to states, but each may be signed separately. 145 states have ratified the Convention, and 146 have ratified the Protocol. This is the key document to refugee protection plus the text of the Protocol, which removed a deadline and geographical restrictions from the Convention.
For versions in other languages (e.g. Russian, Spanish, French and Chinese) go to http://www.unhcr.org/cgi-bin/texis/vtx/home.
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Convention for the Protection of Human Rights and Fundamental Freedoms; Latest version from 2010.
For versions in French, Italian, German and Russian check:
http://www.cö.int/en/web/conventions/full-list/-/conventions/treaty/005?_cöconventions_WAR_cöconventionsportlet_languageId=en_GB