American Driving Society :  americandrivingsociety.org/
Carriage Association of America:  carriageassociationofamerica.com
United States Equestrian Federation: usef.org 
FEI:  fei.org
British Driving Society:  britishcarriagedriving.co.uk
​New Heritage Farm Carriages: newheritagefarm.com
​Driving Essentials:  drivingessentials.com
Driving Digest:  drivingdigest.com
Carriage Driving Today: carriagedrivingtoday.com
​Jacob Arnold (for calculations):  jacobarnoldcombineddriving.com
Hoefnet:  hoefnet.nl
Hippoevent:  hippoevent.at