Grotius, Hugo:
Hugo Grotius, Mare Liberum, 1609-2009 / edited and annotated by Robert Feenstra ; with a general introduction by Jeroen Vervliet. - Leiden [Netherlands] : Brill, 2009 : ill. (chiefly col.), facsims
Einheitssacht.: Mare liberum. . - Includes bibliographical references and index
ISBN 978-90-04-17701-7 : 53