1. The Psychology of Adolescence;Brooks, F.D.,1929
2. The use of age at first appearance of three ossification centers in determining the skeletal status of children;Buehl, C.C.; Pyle, S.I.;J. Pediat,1942
3. Effect of pubertas praecox on the age at which onset of walking occurs;Dennis, W.;Amer. J. Dis. Child,1941
4. Time of appearance and fusion of ossification centers as observed by roentgenographic methods;Flecker, H.;Amer. J. Roentgenol,1942
5. Mental and physical growth in pubertas praecox; report of fifteen years' study of a case;Gesell, A.; Thoms, H.; Hartman, F.B.; Thompson, H.;Arch. Neurol. Psychiat. (Chicago),1939