Não informado. (2018). Report of the U.S. National Committee for the International Biological Program. National Academy of Sciences.
Citação do estilo Chicago (17ª ed.)Não informado. Report of the U.S. National Committee for the International Biological Program. Washington: National Academy of Sciences, 2018.
Citação MLA (8ª ed.)Não informado. Report of the U.S. National Committee for the International Biological Program. National Academy of Sciences, 2018.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.