NBC: Eager drivers worry Mass. bill may slow unionization push

Bloomberg Law: SEIU, Machinists Jointly Launch Massachusetts Uber Drivers Union

WGBH: Thousands of Massachusetts Uber, Lyft drivers move to form a union

Boston.com: Uber, Lyft drivers announce formation of new ‘App Drivers Union’

After ballot measure win, Uber and Lyft workers quickly launch ‘App Drivers Union’