Trial excavations in Helme : medieval stone chapel and earlier wooden sanctuary with 13th–14th century coin offerings = Proovikaevamised Helmes : keskaegne kivikabel ja varasem puust pühamu 13.–14. sajandi ohvrimüntidega - Valk, Heiki 1959-; Kiudsoo, Mauri (Muinsuskaitseamet, 2019)