Walczak, Radosław B., i Macarena Vallejo-Martín. 2021. „Working Conditions and Their Impact on Work Satisfaction in Migrating and Non Migrating Workers. Factor Structure of the Polish Version of the Working Conditions Questionnaire”. Health Psychology Report 9 (1):87–100. https://czasopisma.bg.ug.edu.pl/index.php/HPR/article/view/5750.