CROCKETT, J. U. Lawns and ground covers: The time-life encyclopedia of gardening. Time-Life Books Alexandria.
Chicago-viite (17. p.)CROCKETT, James Underwood. Lawns and Ground Covers: The Time-life Encyclopedia of Gardening. Time-Life Books Alexandria.
MLA-viite (8. p.)CROCKETT, James Underwood. Lawns and Ground Covers: The Time-life Encyclopedia of Gardening. Time-Life Books Alexandria.
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