↑Curd, Patricia (2011). A Presocratics Reader. Selected Fragments and Testimonia (2nd ed.). Indianapolis/Cambridge: Hackett Publishing. pp. 53–63. ISBN978-1603843058.
↑DK fragment B 6: "χρὴ τὸ λέγειν τε νοεῖν τ᾿ ἐὸν ἔμμεναι"; cf. DK B 3 "τὸ γὰρ αὐτὸ νοεῖν ἐστίν τε καὶ εἶναι [It is the same thing that can be thought and that can be]."