Sources of American Law second editionBeau Stennken & Tina M. Brooks. Sources of Law, An Introduction to Legal Research (eLangdell Press 2nd ed. 2016). https://open.umn.edu/opentextbooks/textbooks/sources-of-american-law-an-introduction-to-legal-research
Read: Chapter 6 Secondary Sources, 6-2 and 6-3, p. 146-161