@Book{BVMC:628131, author = {Neumann, Johann Friedrich Wilhelm von}, title = {Joh. Frid. Wilh. de Neumann ... De pactis et contractibus Principum commentatio}, url = {https://www.cervantesvirtual.com/obra/joh-frid-wilh-de-neumann--de-pactis-et-contractibus-principum-commentatio} }