Ph.D., Professor Emerita
University of Jyväskylä, Finland
Pitkänen, L. (1969). A descriptive model of aggression and nonaggression with applications to children's behaviour. Jyväskylä Studies in Education, Psychology and Social Research 19. Jyväskylä, Finland: University of Jyväskylä.
The book is out of print, but available as scanned in the following parts (pdf):