See this online ebook:

  • Saint Bonaventure: The Seraphic Doctor; Minister-General of the Franciscan Order; Cardinal Bishop of Albano, by the Rev. Fr. Laurence Costelloe, O.F.M. (New York: London, Bombay and Calcutta: Longmans, Green and Co., 1911). With Imprimatur. Available at Internet Archive,, and  Project Gutenberg.

See also these texts by and about the Seraphic Doctor (very incomplete list):

On the Feast of Saint Bonaventure of Bagnoregio in the Ordinary Form of the Roman Rite. For other online texts and legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject).