CPGA
The Canadian Professional Golfer's Association.

LPGA
The Ladies Professional Golf Association.

NGF
The National Golf Foundation.

PGA
The Professional Golf Association.

RCGA
The Royal Canadian Golf Association.

USGA
The United States Golf Association. It has served as the national governing body of  golf since its formation in 1894.

U.S.G.A. Handicapping Rules
The handicapping rules used by golfers and tournaments worldwide.

The U.S.G.A. Position Paper on the Equitable Stroke Control Procedure
The latest information on Equitable Stroke Control from the U.S.G.A. Web Site.