A vueltas con la ley, c1995 t.p. (a propósito del Critón de Platón)
Internet encyclopedia of philosophy, 26 August 2011 (Crito, in the "early group" of Plato's dialogues, written between the death of Socrates (399 B.C.) and 387 B.C.)
Thesaurus linguae Graecae, 26 August 2011 (Κρίτων)