- Adam Zamoyski, The Polish Way: A Thousand Year History of the Poles and Their Culture. Published 1993, Hippocrene Books, Poland, ISBN 0-7818-0200-8
- Ministry of Foreign Affairs of Poland, 2002–2007, AN OVERVIEW OF POLISH CULTURE. Access date 12-13-2007.
- Britannica Encyclopaedia "Lekhitic languages, also spelled Lechitic, group of West Slavic language composed of Polish, Kashubian and its archaic variant Slovincian, and the extinct Polabian language. All these languages except Polish are sometimes classified as a Pomeranian subgroup. The West Slavic Languages are a subfamily of the Slavic Languages, a descendant of the Indo-European Languages, itself a descendant of Proto-Indo European languages. In the early Middle Ages, before their speakers had become Germanized, Pomeranian languages and dialects were spoken along the Baltic in an area extending from the lower Vistula River to the lower Oder River."