Não informado. (1950). Agricultural and horticultural Engineering abstracts. National Institute of Agricultural Engineering.
Citação do estilo Chicago (17ª ed.)Não informado. Agricultural and Horticultural Engineering Abstracts. Silsoe, Inglaterra: National Institute of Agricultural Engineering, 1950.
Citação MLA (8ª ed.)Não informado. Agricultural and Horticultural Engineering Abstracts. National Institute of Agricultural Engineering, 1950.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.