LEATHARD, John. Buying – Opportunities and Problems. CHIMIA, [S. l.], v. 44, n. 5, p. 146, 1990. DOI: 10.2533/chimia.1990.146. Disponível em: https://www.chimia.ch/chimia/article/view/1990_146. Acesso em: 3 may. 2024.