[1] Cardani, De subtilitate, lib. 9 De animalibus, fol. 503 et De rerum varietate, lib. 7, cap. 28, fol. 219.
[2] Aristotelis De generatione, lib. i.
[3] Plinii, lib. 7, cap. 12.
[4] Avicennae De animalibus, lib. 9, cap. 1, De moribus animalium.
[5] Aristotelis De natura animalium, lib. 9, cap. 38.
[6] Aristotelis De motu animalium, cap. 6.
[7] Sect. 7.
[8] Cardani De animorum immortalitate, fol. 244.
[9] Caelii Rhodigini, lib. 20, cap. 15.