1997* Singing Back The Sun: A Dictionary of Old Polish Customs and Beliefs, Okana, 1999* Szyjewski, Andrzej: Slavic Religion, WAM, Kraków, 2003* Boris Rybakov.
1997*Singing Back The Sun: "A Dictionary of Old Polish Customs and Beliefs", Okana, 1999*Szyjewski, Andrzej: "Slavic Religion", WAM, Kraków, 2003*Boris Rybakov.