Indeksy

• Institute of Archeology, Jagiellonian University, 1
• Institute of Art. Polish Academy of Sciences, 1
• Institute of Economic Democracy, 1
• Institute of Economics. Latvian Academy of Sciences, 8
• Institute of Geodesy and Cartography, 1
• Institute of History. University of Wroclaw : 1
• Institute of Jewish Studies - Center For Research on Polish Jewry, 1
• Institute of National Remembrance - Commission for the Prosecution of Crimes against the Polish Nation, 1
• Institute of Philosophy at SRC SASA, 8
• Institute of Public Affairs, 1
• Institute of Slavic Studies Polish Academy of Sciences, 1
• Institutio della Enciclopedia Italiana, 3
• Instituto Centrale per il Catalogo e la Documentazione, 1
• Instituto Cervantes de Varsovia [et al.], 1
• Instituto Cubano del Libro, 1
• Instituto de Estudios Politicos, 2
• Instituto de Estudios Regionales y Globales. Facultad de Geografia y Estudios Regionales. Universidad de Varsovia, 1
• Instituto degli Studi Ecclesiastici, 1
• Instituto della Enciclopedia Italiana , 2
• Instituto della Enciclopedia Italiana fondata da G. Treccani, 3