Não informado. (1963). Agricultural Science Review. Cooperative State Experiment Station Service, Department of Agriculture.
Citação do estilo Chicago (17ª ed.)Não informado. Agricultural Science Review. Washington: Cooperative State Experiment Station Service, Department of Agriculture, 1963.
Citação MLA (8ª ed.)Não informado. Agricultural Science Review. Cooperative State Experiment Station Service, Department of Agriculture, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.