Não informado. (1937). Plant inventory. Bureau of Plant Industry, Soils and Agricultural Engineering.
Citação do estilo Chicago (17ª ed.)Não informado. Plant Inventory. Washington: Bureau of Plant Industry, Soils and Agricultural Engineering, 1937.
Citação MLA (8ª ed.)Não informado. Plant Inventory. Bureau of Plant Industry, Soils and Agricultural Engineering, 1937.
警告：这些引文格式不一定是100％准确.