See this legally free ebook:

On the Feast of Saint Thomas the Apostle in the Extraordinary Form of the Roman Rite and of Saint Peter Canisius in the Ordinary Form of the Roman Rite. For other texts and ebooks, you may access the List of Free eBooks (Arranged by Title), the List of Free eBooks (Grouped by Subject), the List of Worth-It Catholic Books.

O Oriens, splendor lucis aeternae, et sol iustitiae: veni, et illumina sedentes in tenebris et umbra mortis. (Text from Fr Z’s Blog)