Não informado. (1969). Progressive Horticulture. Hill Horticulture Development Board, Horticultural Experiments and Training.
Citace podle Chicago (17th ed.)Não informado. Progressive Horticulture. Chaubattia, India: Hill Horticulture Development Board, Horticultural Experiments and Training, 1969.
Citace podle MLA (8th ed.)Não informado. Progressive Horticulture. Hill Horticulture Development Board, Horticultural Experiments and Training, 1969.
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