Pols, Hans Department Ideals and Practices of Rationality, Max Planck Institute for the History of Science, Max Planck Society;
Pols, H. (1999). The world as laboratory: strategies of field research developed by mental hygiene psychologists in Toronto, 1920-1950. In T. R. Richardson, & D. Fisher (Eds.), The development of the social sciences in the United States and Canada: the role of philanthropy of contemporary studies in social and policy issues in education (pp. 115-141). Greenwich, Conn.: Ablex.
