Não informado. (1971). Seed Pathology News. Danish Government Institute of Seed Pathology for Developing Countries.
Citação do estilo Chicago (17ª ed.)Não informado. Seed Pathology News. Copenhagen: Danish Government Institute of Seed Pathology for Developing Countries, 1971.
Citação MLA (8ª ed.)Não informado. Seed Pathology News. Danish Government Institute of Seed Pathology for Developing Countries, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.