Completar frases Sources of labour law (D)Versión en línea Complete the sentences por María Victoria Palacios García 1 regulations professional collective contracts agreements Constitution work specific common Workers' internal rank local Courts Statute The sources of Labour law have specific characteristics in relation to the rest of the legal system . On the one hand , it shares sources with the other branches of law and , on the other hand , there are sources that are exclusive to labour law : collective , the result of the legal recognition of collective negociation , work and local and usages and customs . The provides that the rights and obligations relating to the work relationship are regulated : ? By the legal system : the , laws emanating from the , legal norms with the of the law , and issued by the Government . ? By agreements . ? By the will of the parties expressed in the contract . ? By and professional usages and customs .