Jerome, Saint. [Letter to Paula and Eustochium, 391-392 (4)] in Commentarii in Prophetas Minores 713, 746

[Letter from Saint Jerome to Eustochium]
Jerome sets Haggai in its historic context in the prologue, and apologizes for his Latin style in a little note to the reader at the end.
Online at Epistolae (Duplicated) (See also Bibliographia record).