Francis Sales Betten, The Roman Index of Forbidden Books (1920)
“ Of still greater importance than this catalogue are the first thirty-four pages, which give, in the "Apostolic Constitutions," the general laws of the Church regarding books. There are only two "Constitutions." But the whole work is introduced by a brief of Leo XIII, in which the Pontiff declares that this edition is to be the authentic one for the whole Church. It is to be binding on all the faithful of the universe, regardless of race or language, nationality or country, education, learning or station in life. ”
