Novak authored Magnum Tempus,published as Magnum tempus: ilirizam i katoličko sveštenstvo : ideje i ličnosti, 1830-1849 by Novak, Viktor; Nova knjiga, Belgrade, 1987 Magnum Sacerdospublished as Josip Juraj Strossmayer: apostol Jugoslovenske misli by Novak, Viktor; Savez sokola kraljevine Jugoslavije, Belgrade, 1941 and Magnum Crimen (The Great Crime - a half-century of clericalism in Croatia), a trilogy about the Roman Catholic Church in Yugoslavia and its relation to the Kingdom of Yugoslavia, the Roman Curia, and the Croatian clerical nationalism including Ustashe supporters and World War II.Magnum Crimen [1948], pages I-XV From 1929 to 1959, he was a professor of Yugoslav history at the University of Belgrade. The Vatican Curia placed Magnum Crimen on their list of banned books Index librorum prohibitorum and named Viktor Novak "an enemy of Catholic Church".
