What's one of the written sources we know he used?
我们已知他使用什么文本资料呢？
Books written in the present day by historians are secondary sources.
现今历史学家写的书是间接来源。
The sources of private international law include customary statute (written) law.
国际私法的渊源包括习惯法和成文法。
The sources of private international law include customary statute (written) law.
国际私法的渊源包括习惯法和成文法。
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