ROY, Donald. Konsumgenossenschaften im Strukturwandel: Consumer Co-operatives in a Changing World: Comparative Studies on Structural Changes of Some Selected Consumer Cooperative Societies in Industrialized Countries. Wirtschaft und Gesellschaft, Wien, Österreich, v. 17, n. 1, p. 108–111, 1991. Disponível em: https://journals.akwien.at/index.php/wug/article/view/2038.. Acesso em: 23 mar. 2026.