Não informado. (1942). Plant science literature. U.S. Department of Agriculture, Bureau of Plant Industry.
Citação do estilo Chicago (17ª ed.)Não informado. Plant Science Literature. Washington: U.S. Department of Agriculture, Bureau of Plant Industry, 1942.
Citação MLA (8ª ed.)Não informado. Plant Science Literature. U.S. Department of Agriculture, Bureau of Plant Industry, 1942.
Atenció: Aquestes cites poden no estar 100% correctes.