Industrial relations. International Labour Organisation. დაარქივებულია ორიგინალიდან — 9 ოქტომბერი 2018. ციტირების თარიღი: 9 October 2018.
An ILO mission in 2000 reported that "the number of assassinations, abductions, death threats and other violent assaults on trade union leaders and unionized workers in Colombia is without historical precedent". According to the Colombian Government, during the period 1991–99 there were 593 assassinations of trade union leaders and unionized workers while the National Trade Union School holds that 1 336 union members were assassinated." – ILO, 16 June 2000, Special ILO Representative for cooperation with Colombia to be appointed by Director-General
Dvorak, J., Civinskas, R. (2018). The Determinants of Cooperation and the Need for Better Communication between Stakeholders in EU Countries: The Case of Posted Workers. Polish Journal of Management Studies, Vol. 18 (1), p. 94-106 https://pjms.zim.pcz.pl/resources/html/article/details?id=183839
