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Columella, L. J. M. (70). Of husbandry.Book 9.
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Guillemin, A. (1867). The Heavens: An Illustrated Handbook of Popular Astronomy (J. Norman Lockyer, Ed.). London: Richard Bently.
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Wallace, A. R. (1869). The Malay Archipelago the land of the orang-utan and the bird of paradise: a narrative of travel, with studies of man and nature.
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Tyndall, J. (1879). The Electric Light. Fortnightly review, 25(146), 197–216.
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Siemens, C. W. (1880). III. On the influence of electric light upon vegetation, and on certain physical principles involved. Abstr. Pap. Printed Phil. Trans. R. Soc. Lond., 30(200-205), 210–219.
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