Não informado. (1969). Progressive Horticulture. Hill Horticulture Development Board, Horticultural Experiments and Training.
Citação do estilo Chicago (17ª ed.)Não informado. Progressive Horticulture. Chaubattia, India: Hill Horticulture Development Board, Horticultural Experiments and Training, 1969.
Citação MLA (8ª ed.)Não informado. Progressive Horticulture. Hill Horticulture Development Board, Horticultural Experiments and Training, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.