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Aristotle (c. 350 BC). Historia Animalium. IX, 622a: 2–10. Cited in Borrelli, Luciana; Gherardi, Francesca; Fiorito, Graziano (2006). A catalogue of body patterning in Cephalopoda. Firenze University Press. شابک۹۷۸−۸۸−۸۴۵۳−۳۷۷−۷. Abstractبایگانیشده در ۶ فوریه ۲۰۱۸ توسط Wayback Machine
Aristotle (c. 350 BC). Historia Animalium. IX, 622a: 2–10. Cited in Borrelli, Luciana; Gherardi, Francesca; Fiorito, Graziano (2006). A catalogue of body patterning in Cephalopoda. Firenze University Press. شابک۹۷۸−۸۸−۸۴۵۳−۳۷۷−۷. Abstractبایگانیشده در ۶ فوریه ۲۰۱۸ توسط Wayback Machine