Kaplan, Fred. 2009. 1959: The Year Everything Changed. Hoboken, NJ: Wiley.
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Gair, 2007, American Counterculture, p. 4.
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Обзор и оценку данной информации см. в: Scott, Isabel M. L., Andrew P. Clark, Lynda G. Boothroyd, and Ian S. Penton-Voak. 2013. “Do men’s faces really signal heritable immunocompetence?” Behavioral Ecology 24:579–89. Родственная теория сигналов мужского лица изложена в: Fink, B., N. Neave, and H. Seydel. 2007. “Male facial appearance signals physical strength to women.” American Journal of Human Biology 19:82–87.
