Reference material question . . .

[Marty Rogers]

The Rule Book, Case Book, and Officials Manual can be ordered online at NFHS.org.

There is a chart in the Officials Manual which shows where throw-ins are to occur.
Draw a diagonal line from the end of the free throw line (where the free throw lane line meets it) to the corner of the court where the same sideline and endline meet (approx 45 degree angle). Do the same thing from the other side of the free throw line to other corner of the court. Then shade in that entire area, along with the semi-circle above the free throw line. It looks like a big triangle. All violations, held balls, non-shooting fouls, etc. that happen in this shaded area will result in an ENDLINE throw-in even with where the infraction occured (except never in the lane under the backboard).
All throw-ins that occur outside of this shaded area will result in a SIDELINE throw-in even with where the infraction occured.
Boarderline ones, or if you're not sure, just make a quick decision and put the ball in play.

Of course, there are many other times where there is a proper location to put the ball back into play, like at the start of a quarter, after a Technical foul, after a double foul, if there is a throw-in violation where the ball goes out-of-bounds untouched, etc. The book indicates what to do in such situations. Good luck.