KLAFKOWSKI, Piotr. Nicholas Roerich. The mysterious brief reflections on three Roerich controversies. Studia Rossica Gedanensia, [S. l.], p. 407–428, 2016. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/SRG/article/view/6699. Acesso em: 25 aug. 2024.