After Red Sox sign-stealing accusation, a brief history of cheating in baseball - The Washington Post
MLB Letter Confirms Yankees Used Technology for Sign Stealing - The New York Times
What did New York Yankees do -- and does it matter? What you need to know about sign-stealing letter - ESPN
MLB, Yankees statements on 2017 letter
MLB Yankees Letter Sign Stealing Court Orders Release –
New York Yankees used replay room to steal signs in 2015-2016, MLB letter confirms
Appellate Court Unsealing 2017 Letter From MLB To Yankees Regarding Rules Violation - MLB Trade Rumors
Yankees up in arms after judge orders to unseal MLB letter
In Astros Inquiry, Rob Manfred Raises Possibility of Big Penalties - The New York Times
Sign stealing - Wikipedia
Astros, Red Sox sign-stealing timeline: Everything we know about MLB scandals
Yankees were fined $100,000 for improper use of dugout phone
MLB Letter Confirms Yankees Used Technology for Sign Stealing - The New York Times