"The Psychological Limits of Population," The Center Magazine. A Publication of the Center for the Study of Democratic Institutions, 1970

"The Psychological Limits of Population," The Center Magazine. A Publication of the Center for the Study of Democratic Institutions, 1970, Box: 2. William R. Ewald papers, 4876. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/500254 Accessed October 22, 2025.