Não informado. (1928). Bureau of Standards Journal Research. U.S. Department of Commerce, National Bureau of Standards.
Citação do estilo Chicago (17ª ed.)Não informado. Bureau of Standards Journal Research. Washington: U.S. Department of Commerce, National Bureau of Standards, 1928.
Citação MLA (8ª ed.)Não informado. Bureau of Standards Journal Research. U.S. Department of Commerce, National Bureau of Standards, 1928.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.