Note 23 — THE ECCLESIASTICAL ORDERS OF KNIGHTHOOD Part III
Reading edition
An interesting account on the vows and obligations of the Spanish Military Orders can be found in: Alonso Peñafiel y Araugo, Obligaciones y excellentias de los tres ordenes militares Santiago, Calatrava y Alcantara (Madrid: Diego Dias de la Carrera, 1643)—Microfilm in the Library of Congress.