Stella Chess
... that a study by child psychiatrist Stella Chess and her husband, Alexander Thomas, found that children could be divided into three different categories: "easy", "difficult", and "slow to warm up"?
... that a study by child psychiatrist <b id="mwAso"><a href="./Stella_Chess" id="mwAss" rel="mw:WikiLink" title="Stella Chess">Stella Chess</a></b> and her husband, Alexander Thomas, found that children could be divided into three different categories: "easy", "difficult", and "slow to warm up"?