1. Behrents , R. Broadbent , B. 1984 A chronological account of the Bolton-Brush Growth Studies: In search of truth for the greater good of man https://dental.case.edu/media/school-of-dental-medicine/departments--programs/bolton-brush/Chronological_Account_BoltonBrush.pdf
2. Birkner , R. 1978 Normal radiographic patterns and variances of the human skeleton-an X-ray atlas of adults and children
3. Neural-tube defects;Botto;New England Journal of Medicine,1999