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Cohen, Donald; Schmidt, James P. (1979). «Ambiversion: Characteristics of Midrange Responders on the Introversion-Extraversion Continuum». Journal of Personality Assessment. 43 (5): 514–6. PMID16367029. doi:10.1207/s15327752jpa4305_14
forbes.com
Cain, Susan (2012), Quiet: The Power of Introverts in a World That Can't Stop Talking at page 3 (Introduction) and page 280 (note 11). • Goudreau, Jenna, "The Secret Power Of Introverts" (WebCite archive), Forbes, 26/12012.
Cohen, Donald; Schmidt, James P. (1979). «Ambiversion: Characteristics of Midrange Responders on the Introversion-Extraversion Continuum». Journal of Personality Assessment. 43 (5): 514–6. PMID16367029. doi:10.1207/s15327752jpa4305_14
Cain, Susan (2012), Quiet: The Power of Introverts in a World That Can't Stop Talking at page 3 (Introduction) and page 280 (note 11). • Goudreau, Jenna, "The Secret Power Of Introverts" (WebCite archive), Forbes, 26/12012.