889.05 Common law of sister states. The unwritten or common law of any state or territory of the United States may be proved by parol evidence, and by the books of reports of cases adjudged in its courts.
Wisconsin Legal Code
889.05 Common law of sister states. The unwritten or common law of any state or territory of the United States may be proved by parol evidence, and by the books of reports of cases adjudged in its courts.