Não informado. (1919). Scientific Papers of the Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards.
Citação do estilo Chicago (17ª ed.)Não informado. Scientific Papers of the Bureau of Standards. Washington: U.S. Department of Commerce, National Bureau of Standards, 1919.
Citação MLA (8ª ed.)Não informado. Scientific Papers of the Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards, 1919.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.