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Research Tools

Online Public Access Catalog

The OPAC (Online Public Access Catalog) includes bibliographical references to books, periodicals and articles that are available in the library of the Max Planck Institute for Comparative Public Law and International Law. Searching our holdings for keywords or specific titles via the internet is also possible.

CPIL - Beta Version (Ressource Discovery System)

A search tool that allows parallel searching of MPIL and MPG data sources and also serves as a search interface for the external index EDS, which includes the content of more than 100 databases under its surface.

Systematic Search

The library possesses an in-house classification system, which is used to classify books and journals. The classification supports your search with regard to content and is divided into three sections. (Unfortunately the classification system for books and journals hasn’t been translated into English yet.)

Europäische Union


Einzelne Länder

Please download the classification system’s PDF version via:

Documentation of articles

The wide-ranging selection of periodicals (yearbooks) and collection editions (inter alia commemorative publications) in international law available at the Library are continuously evaluated and classified by the research staff. The evaluation of journals was ceased at the end of 2018.

The articles' classification is divided into three sections. The evaluation of comparative and municipal law was discontinued in 2010.

International Law

Comparative Law (- 2010)

Municipal Law (- 2010)

Classification of periodical and monographic literature dealing with public international law was also published in the bibliography "Public International Law (PIL)". The printed edition ceased publication with Vol. 41 (2015). By using the PIL classification the content (1996 - 2010) can still be searched via the Institute's OPAC.

Finding digitized resources

Members of the Institute have access to electronic journals, databases and e-books. In addition to the licenses bought exclusively for the Institute, the Max Planck Society (MPS) provides the Institute with numerous licenses.


Overview and links to e-journals:

Electronic Journals Library (EZB)

Contains links to e-journals available at the Institute. 


MPG.ReNa (MPG Resource Navigator)

Contains all databases, digital collections and electronic reference books licensed by the Institute and the Max Planck Society.



Includes all centrally purchased e-books of the Max Planck Society.

Helpful links

Library catalogues of Max Planck Institutes with legal research

Union catalogues

Library catalogues


Virtual Law Library (Virtuelle Fachbibliothek Recht) of Berlin State Library

Peace Palace Library - The International Law Library

CURIA - Library of the Court of Justice of the European Union