Rodgers, JL; Cleveland, HH; Van Den Oord, E; Rowe, DC (2000). “Resolving the debate over birth order, family size, and intelligence”. The American Psychologist55 (6): 599–612. doi:10.1037/0003-066X.55.6.599. PMID10892201.
Rodgers, JL; Cleveland, HH; Van Den Oord, E; Rowe, DC (2000). “Resolving the debate over birth order, family size, and intelligence”. The American Psychologist55 (6): 599–612. doi:10.1037/0003-066X.55.6.599. PMID10892201.