Butschek, Felix. “Zur Entstehung Der Arbeitsmärkte: Labour Market Evolution. The Economic History of Market Integration, Wage Flexibility and the Employment Relation”. Wirtschaft Und Gesellschaft, vol. 21, no. 2, Apr. 1995, pp. 332-5, https://journals.akwien.at/index.php/wug/article/view/1885.