David Oliver Cauldwell, Relation of the Endocrines and Heredity to Development and Intellect, B-615, 1947, id2550, Box: 4, Item: 72. Emanuel Haldeman-Julius Big Blue Books and Larger Books Collection, SC-EHJB. Special Collections & Archives. https://findingaids.csun.edu/repositories/2/archival_objects/18751 Accessed June 20, 2026.