Não informado. (1969). Journal of the American Society for Horticultural Science. American Society for Horticultural Science.
Citace podle Chicago (17th ed.)Não informado. Journal of the American Society for Horticultural Science. Alexandria, Va: American Society for Horticultural Science, 1969.
Citace podle MLA (8th ed.)Não informado. Journal of the American Society for Horticultural Science. American Society for Horticultural Science, 1969.
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