P1042 Includes bibliographical references and index.
P1073 Parallel Latin text with English translation and critical apparatus.
Buy a copy
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
De rectoribus Christianis = On Christian rulers. ISBN 9781843835660. Published by Boydell & Brewer in 2010. Publication and catalogue information, links to buy online and reader comments.