Cases may have varying degrees of authority depending on the country's legal system. Whereas cases are the highest authority in common law countries, they may have less authority in civil law jurisdictions. JuriGlobe - World Legal Systems provides information about the legal system(s) in force in various countries.
Cases from other countries may not be translated into English, and therefore having a working knowledge of the language spoken in the country can be very beneficial. JuriGlobe - World Legal Systems provides information on the official languages of different political entities around the world.
Determine where court decisions are published by looking up the country in GlobaLex's Foreign Law Research Guides. This source may tell you whether there are any English translations.
The following two sources also provide links to the higher courts' websites of countries worldwide:
Many countries publish their statutes, regulations, and codes on freely accessible government websites. Both GlobaLex and the Guide to Law Online: Nations of the World indicate government websites where legislation can be found on each country's page.
Legislation published on government websites is most likely to be presented in the country's official language, and not necessarily translated into English. Therefore, having a working knowledge of a country's official language may be required. JuriGlobe - World Legal Systems provides information on the official languages of different political entities around the world.
There are various compendium sources that collect certain types of laws in English translation. For example: