 Apollinaris Sulpicius, in that passage of Aulus Gellius which is the principal authority with respect to the genealogy of the Cato family, speaks of the son as having written “egregios de juris disciplina libros”.Festus (under "Mundus") cites the "commentarii juris civilis" of Cato, probably the son, and Julius Paullus cites Cato's 15th book.Cicero censures Cato and Brutus for introducing in their published responsa the names of the persons who consulted them.