Evidence Explained

Elizabeth Shown Mills' companion site to her book of the same name is the standard reference for citing genealogical sources — not just formatting, but thinking through what kind of source you're actually looking at and how much weight it can bear. I turn to this whenever a source doesn't fit neatly into a citation template I already know.

U.S. Historical Law Guides

State-by-state guides to the laws that shaped the records genealogists rely on — marriage age and consent, property and dower rights, intestate succession, guardianship, court-testimony qualifications — from each state's settlement period through 1950, written in plain language rather than legal jargon. Every guide cites the digests, codes, and session laws behind it, with links to the primary sources where they've been digitized. I've found this invaluable for understanding not just what a record says, but what the law required and allowed at the time it was created.