St. Augustine of Hippo / H. Browne
Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
De opera monachorum ('On the Work of Monks') was written about 400. This was just before Augustine wrote On the good of marriage, On holy virginity, and On the good of widowhood, meaning that in a brief period he had written about all the major styles of living.