KALINOWSKI, Sławomir. The working poor in the European Union. In International scientific days 2018. 1. vyd. online (2739 s.). ISBN 978-80-7598-180-6. Towards productive, sustainable and resilient global agriculture and food systems. Praha : Wolters Kluwer ČR, 2018, s. 977-991, online. Available on Internet:<https://doi.org/10.15414/isd2018.s4.08>