Trinity

"The Mystery of the Family of God" by Scott Hahn. Scripture and the Mystery of the Family of God. Edited by Scott Hahn and Leon J. Suprenant, Jr. (Steubenville, OH: Emmaus Road Publishing, 1998) pp. 3-23.
The Spirit of the Father and of the Son by François-Xavier Durrwell. transl. Robert Nowell. (Middlegreen, England: St Paul Publications, 1990).
Mary: Icon of the Spirit and of the Church by François-Xavier Durrwell. transl. Robert Nowell. (Middlegreen, England: St Paul Publications, 1991).
Mariology (vol. 1) by Rev. M. J. Scheeben. transl. Rev. T. L. M. J. Geukers. (St. Louis: Herder, 1946) pp. 154-183.
The Mysteries of Christianity by Matthias Joseph Scheeben. transl. Cyril Vollert, S.J. (St. Louis: Herder, 1946) pp. 149-189.