http://www.iaabo.org/cards.htm
I contacted the MIAA and made them aware that their Shot Clock Document does not follow NCAA rules regarding a throw-in. The document says it follows NCAA rules. I was told that the document has not been updated and they were not aware that it was wrong. The link above from IAABO has nice instruction cards for scorers, timers and shot clock operators (per NCAA rules for shot clock).
I notice all three links above are different from the current NCAA procedure which is to start the shot clock when the ball is legally TOUCHED or touches a player in bounds on a throw-in. These links say to start the shot clock when a team GAINS POSSESSION in bounds after a throw-in. The NCAA reference is Rule 2 Section 13 Article 5.
As far as I know, Massachusetts HS referees have been following the (current) NCAA shot clock procedure for as long as I can remember.