Apollodorus. The Library. 1.7.

(perhaps) Aristotle. The Nichomachean Ethics. 10.8.

Chaucer, Geoffrey. The Canterbury Tales (f. pr. 1477). 'The Tale of Sir Thopas.'

Cicero. Tusculanarum Disputationum. 1.38.

(perhaps) Plato. Phaedo. 17.

REFERENCE : David Bevington, ed. Endymion. The Revels Plays. Manchester: Manchester University Press, 1996. 10-14.