Vol. IV, Teoria e Storia della Storiografia, 1920. (Translated under the tide of "Theory and History of Historiography" in England, and under the ride of "History: Its Theory and Practice" in the United States.)
Saggi filosofici ("Philosophical Essays"):
Vol. I, Problemi di Estetica, 1910 ("Problems of Æsthetics.")
Vol. II, La Filosofia di Giambattista Fico, 1911. (Translated under the title of "The Philosophy of Vico.")
Vol. III, Saggio sullo Hegel, 1913. ("Essay on Hegel," followed by essays on the history of philosophy; the essay on Hegel translated under the tide of "What Is Living and What Is Dead in the Philosophy of Hegel.")
Vol. IV, Materialismo Storico ed economia marxistica, 1918. (Translated under the title of "Historical Materialism and Marxian Economics.")
Vol. V, Nuovi Saggi di Estetica, 1920. ("New Essays on Æsthetics"; contains the Breviario di Estetica, translated under the title of "The Essence of Æsthetics.")
Vol. VI, Frammenti di Etica, 1922. ("Fragments of Ethics.")
Scritti di Storia letteraria e politica. ("Writings on Literary and Political History"):
Vol. I, Saggi sulla Letteratura italiana del Seicento, 1911. ("Essays on Italian Literature in the Seventeenth Century.")