Койчева, Р. (2018) „Protection of Temporary Workers in 2008/104 EC Directive on Temporary Agency Work - Flexibility or Security?“, Научни трудове, (2), стр. 183–190. достъпен на: https://bjiep.e-dnrs.org/index.php/rp/article/view/5575 (отворен на: 22 Юли 2026).