11 common unwritten baseball rules: the stupid, broken, & OK
If MLB's unwritten rules were worth following, they would be written down - Beyond the Box Score
6 Baseball Myths & Unwritten Rules Not To Mess With
Baseball's unwritten rules can be, in a word, baffling
The 'Code': Ten unwritten baseball rules you might not know
Baseball's unwritten rules, Independent Review
Baseball's 25 Biggest Unwritten Rules, News, Scores, Highlights, Stats, and Rumors
Dodgers: Unwritten rules of baseball and their relevance to players
Baseball: Star breaks unwritten rule by hitting a home run off 3-0 pitch
Baseball's Unwritten Rules: Where Does It Say You Can't Do That? - The New York Times