http://www.legislation.gov.uk/anaw/2017/4/section/4/welshDeddf yr Undebau Llafur (Cymru) 2017cyStatute Law Database2023-09-01Expert Participation2017-09-13I14Enw byrEnw byr y Ddeddf hon yw Deddf yr Undebau Llafur (Cymru) 2017.