Massachusetts Horticultural Society, Horticultural Society of New York, & Pennsylvania Horticultural Society. Horticulture. Massachusetts Horticultural Society.
Lua i Stíl Chicago (17ú heag.)Massachusetts Horticultural Society, Horticultural Society of New York, agus Pennsylvania Horticultural Society. Horticulture. Boston: Massachusetts Horticultural Society.
Lua MLA (8ú heag.)Massachusetts Horticultural Society, et al. Horticulture. Massachusetts Horticultural Society.
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