"[S]hould neither treaty or custom prove adequate to resolve a contentious question, resort may be had to “general principles” as a subsidiary source. The general principles are commonly recognized as the norms existing in the municipal law of the majority of nations. When such a norm (i.e. the rule against judicial bias) has achieved the requisite degree of usage, it may thus be recognized as a subsidiary source of the substantive content of international law." - Oxford Reference
General Principles As a Source of International Law by 
General Principles and the Coherence of International Law by 
General Principles of Law in the Decisions of International Criminal Courts and Tribunals by 
General Principles of Law Recognized by Civilized Nations (1922-2018) by 
General Principles of Law and International Due Process by To Find Books in UC Law SF library on a foreign law topic, try searching for Law and the country name as a subject header and a key word related to the legal issue. Examples are provided below.
Some books provide comparisons of law from different jurisdictions. This series may provide you with a collection or articles about the principles of law across multiple jurisdictions.
If you are researching a constitutional law issue:
HeinOnline Provides an excellent Finding tool for Foreign Law Articles.
To quickly find relevant primary and secondary sources on a specific legal topic in another country, use:
If the Foreign Law Guide provides the name of a law or legal resource, but does not provide a direct link, you can try searching for the publication in the UC Law SF catalog.
To quickly compare law on a particular legal issue across multiple countries, use:
