Italian Historiography in the Twentieth Century, translated by Carol Lansing. An analysis of the development of historical studies and approaches of the twentieth century in the Italian context.
Storia di Roma. (co-authored) A multi-volume historical study documenting the history of Rome from its origin and the ancient era, through various ages including the late Antiquity, Middle Ages, Renaissance, Early Modern period, to contemporary developments until the twentieth century.
I democratici cristiani di fronte alle due Italie (Christian Democrats facing Two Italies). An exploration of cultural divisions or contrasts faced by the Christian Democrats and how the party negotiated those differences or contradictions in Italian society of the time.
Il partito di massa tra i cattolici: dalla Rerum Novarum alla Democrazia Cristiana (Mass Catholic Party: From Rerum Novarum to Christian Democracy) A historical examination of the mass-based movement rooted in catholic ideals, beginning with Pope Leo XIII's Encyclical Rerum Novarum, that gave foundation to the formation of Democrazia Cristiana as a prominent party in Italy.
Intellettuali senza partito (Nonpartisan Intellectuals). Discusses intellectual thought and debates surrounding historical approaches, methodologies, and ideologies, primarily in the mid-1900s, and attempts to define a nonpartisan or unbiased historical practice.
Along with authored publications, Napoleone G. Fiumi served as director of numerous historical journals over the span of his scholarly career and edited and contributed to historical collections focusing on specific themes like Catholic thought, Renaissance studies, etc.