Charles Blair Macdonald Timeline Project

https://www.cbmacdonald.com

Donald Ross Society

https://rosssociety.org

The Tillinghast Association

http://www.tillinghast.net/

The Walter J. Travis Society

https://travissociety.com

American Society of Golf Course Architects

http://golfdesign.org/

Golf Course Superintendents Association of America

http://GCSAA.org/

United States Golf Association

http://www.USGA.org

PGA of America

https://www.pga.com

Robert Trent Jones Society
https://roberttrentjonessociety.com