score:4
This is a good introduction to the history and philosophy of Modernism:
Emile Poulat, Histoire, dogme et critique dans la crise moderniste (Tournai, Belgium: Casterman, 1962).
e-book in italiano: Storia, dogma, e critica nella crisi modernista
Romano Amerio, Iota Unum: A Study of Changes in the Catholic Church in the XXth Century (Kansas City, MO: Sarto House, 1996).
e-book en español: Iota Unum: Estudio sobre las transformaciones de la Iglesia Católica en el siglo XX
Alexander Roper Vidler, A Variety of Catholic Modernists (Cambridge: Cambridge University Press, 2009).
Jean Baptiste Lemius and John Fitzpatrick, Catechism on Modernism According to the Encyclical “Pascendi Dominici Gregis” of His Holiness Pius X (London: R. & T. Washbourne, 1908).
Fr. Lemius is the presumed drafter of Pope St. Pius X's encyclical on Modernism, Pascendi.
Thomas Joseph Walshe, The Principles of Catholic Apologetics : A Study of Modernism Based Chiefly on the Lectures of Père Garrigou-Lagrange “De Revelatione per Ecclesiam Catholicam Proposita” Adapted and Re-Arranged (Eugene, Or.: Wipf & Stock Publishers, 2009).
Jürgen Mettepenningen, Nouvelle Théologie - New Theology: Inheritor of Modernism, Precursor of Vatican II (London; New York: T & T Clark, 2010).
The "New Theology" is neo-Modernism; Pope Pius XII condemned it in his 1950 encyclical Humani Generis, subtitled: "concerning some false opinions threatening to undermine the foundations of Catholic doctrine." It's drafter is thought to have been Fr. Réginald Garrigou-Lagrange, O.P, ∵ he wrote "The structure of the encyclical Humani Generis." Cf. also: Greenstock, David L., T.O.P., "Thomism and the New Theology," The Thomist, 13 (1950), p. 567 & this quote from it re: theological conclusions.