See this free ebook:

  • The Principles of Christian Apologetics: An Exposition of the Intellectual Basis of the Christian Religion, Specially Written for Senior Students, by Thomas Joseph Walshe (London, New York [etc.] Longmans, Green and Co, 1919). With Imprimatur. Available at Internet Archive and Open Library.

On the Feast of St. Thomas the Apostle in the Extraordinary Form of the Roman Rite. For more legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject). Blessed be God in His angels and in His saints!