"Introduction: The North and South of Temperament" Pages 2-3 of Quiet'' Cain maintains that there are introverts and extroverts in almost every species of the animal kingdom, each having a corresponding survival strategy.
"Introduction: The North and South of Temperament" Quiet halaman 2-3 Cain menegaskan bahwa ada sifat introver dan ekstrover di hampir semua spesies hewan.