Não informado. (1891). Bulletin of the Washington Agricultural Experiment Station. Washington Agricultural Experiment Station.
Citação do estilo Chicago (17ª ed.)Não informado. Bulletin of the Washington Agricultural Experiment Station. Pullman, Wash: Washington Agricultural Experiment Station, 1891.
Citação MLA (8ª ed.)Não informado. Bulletin of the Washington Agricultural Experiment Station. Washington Agricultural Experiment Station, 1891.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.