Some aspects of the development of Wolin in the 8th-11th centuries in the light of the results of new research - Filipowiak, Władysław (. Polish lands at the turn of the first and the second milennia. - Warsaw : Institute of Archeology and Ethnology, Polish Academy of Sciences, 2004. - 387 S.. - Ill., graph. Darst., Kt.. - ISBN 83-89499-11-8, 2004)