The Official Rules of Golf
The Rules of Golf are comprehensive and provide answers to the many issues that arise in a game that is played worldwide on many different types of courses by players of all abilities.
(source www.randa.org)
The online Rules - Players Edition can be found on the R&A website.
The Player's Edition of the Rules of Golf is intended for you, the golfer. It contains the Rules situations that occur most commonly on the course and is an abridged version of the full Rules. Although its text is edited, it gives you the same answer that is in the full Rules of Golf and so it is a functioning Rule book.
Downloads
This is a selection of interesting publications produced by The R&A.
(source www.randa.org)