Redaktionen, -. “W. F. Willoughby: State Activities in Relation to Labor in the United States. Baltimore, The Johns Hopkins Press. April -May 1901”. Nationaløkonomisk Tidsskrift 3 (januar 1, 1901). Set marts 3, 2026. https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/58188.