McGregor, Arthur. "Estelle Klein"(PDF). Ontario Council of Folk Festivals Folkprints. Archived from the original(PDF) on February 4, 2006. Retrieved 2008-03-24.
McGregor, Arthur. "Estelle Klein"(PDF). Ontario Council of Folk Festivals Folkprints. Archived from the original(PDF) on February 4, 2006. Retrieved 2008-03-24.