World Health Organization & World Health Organization. (1998). Regulatory Situation of Herbal Medicines. World Health organization.
Citação do estilo Chicago (17ª ed.)World Health Organization e World Health Organization. Regulatory Situation of Herbal Medicines. Geneva: World Health organization, 1998.
Citação MLA (8ª ed.)World Health Organization e World Health Organization. Regulatory Situation of Herbal Medicines. World Health organization, 1998.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.