1. 2. Freudenberg N. , Clark N. , Feldman C. . et al: The Impact of Bronchial Asthma on School Attendance and Performance. Paper read before the 1979 annual meeting of the American Public Health Association, New York.
2. A comparison of absentee rates of elementary school children with asthma and nonasthmatic schoolmates;Parcel;Pediatrics,1979
3. 4. Klein SD : Chronic Kidney Disease: Impact on the Child and Family and Strategies for Coping, doctoral thesis. University of Minnesota, Minneapolis, 1975.