ERIH PLUS (originally called the European Reference Index for the Humanities or ERIH) is an index containing bibliographic information on academic journals in the humanities and social sciences. It has been called "the most important and prestigious reference index in the European Union when it comes to international quality and impact accreditation for scientific journals in the areas of Humanities and Social Sciences" by a librarian of the Charles University. The index includes all journals that meet the following requirements: "explicit procedures for external peer review; an academic editorial board, with members affiliated with universities or other independent research organizations; a valid ISSN code, confirmed by the international ISSN register; abstracts in English and/or another